From 53bce34456af4fbc0d97812c8b92a8b85f1afc25 Mon Sep 17 00:00:00 2001
From: oleibman <10341515+oleibman@users.noreply.github.com>
Date: Sun, 2 Mar 2025 13:56:34 -0800
Subject: [PATCH 1/2] Add Ability to Add Custom Functions to Calculation

For an overview of why this is desired (and ways that people have coped with its absence), see issue #2900 and issue #4048; also PR #4043 which will be superseded by this PR.

The list of Excel functions is moved from Calculation/Calculation to its own member. I believe that it is done in a way that will not cause big complications to two experiments from @MarkBaker (PR #2714 and PR #2734). I believe it is also done in such a way that further refactoring of Calculation can follow this model.

Custom functions can be added or removed from the function list. You cannot add a function if it already exists in the list, and you cannot remove a non-custom function from the list. They will, of course, not be understood by Excel if written to a spreadsheet; the use case is mainly using the Calculation engine outside of spreadsheet context.
---
 CHANGELOG.md                                  |    4 +-
 .../Calculation/Calculation.php               | 2693 +----------------
 .../Calculation/CalculationBase.php           |   55 +
 .../Calculation/FunctionArray.php             | 2658 ++++++++++++++++
 .../Calculation/CustomFunction.php            |   22 +
 .../Calculation/CustomFunctionTest.php        |   35 +
 6 files changed, 2791 insertions(+), 2676 deletions(-)
 create mode 100644 src/PhpSpreadsheet/Calculation/CalculationBase.php
 create mode 100644 src/PhpSpreadsheet/Calculation/FunctionArray.php
 create mode 100644 tests/PhpSpreadsheetTests/Calculation/CustomFunction.php
 create mode 100644 tests/PhpSpreadsheetTests/Calculation/CustomFunctionTest.php

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 1a5bc4e83e..0ec0ab7759 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -9,7 +9,7 @@ and this project adheres to [Semantic Versioning](https://semver.org).
 
 ### Added
 
-- Nothing yet.
+- Add ability to add custom functions to Calculation. [PR #4390](https://github.com/PHPOffice/PhpSpreadsheet/pull/4390)
 
 ### Removed
 
@@ -36,7 +36,7 @@ and this project adheres to [Semantic Versioning](https://semver.org).
 ### Added
 
 - Support Justify Last Line. [Issue #4374](https://github.com/PHPOffice/PhpSpreadsheet/issues/4374) [PR #4373](https://github.com/PHPOffice/PhpSpreadsheet/pull/4373)
-- Allow Spreadsheet clone. [PR #437-](https://github.com/PHPOffice/PhpSpreadsheet/pull/4370)
+- Allow Spreadsheet clone. [PR #4370](https://github.com/PHPOffice/PhpSpreadsheet/pull/4370)
 
 ### Changed
 
diff --git a/src/PhpSpreadsheet/Calculation/Calculation.php b/src/PhpSpreadsheet/Calculation/Calculation.php
index 28b4645bde..8b78e0d978 100644
--- a/src/PhpSpreadsheet/Calculation/Calculation.php
+++ b/src/PhpSpreadsheet/Calculation/Calculation.php
@@ -23,7 +23,7 @@
 use ReflectionParameter;
 use Throwable;
 
-class Calculation
+class Calculation extends CalculationBase
 {
     /** Constants                */
     /** Regular Expressions        */
@@ -214,2658 +214,6 @@ public static function getExcelConstants(string $key): bool|null
         return self::$excelConstants[$key];
     }
 
-    /**
-     * Array of functions usable on Spreadsheet.
-     * In theory, this could be const rather than static;
-     *   however, Phpstan breaks trying to analyze it when attempted.
-     */
-    private static array $phpSpreadsheetFunctions = [
-        'ABS' => [
-            'category' => Category::CATEGORY_MATH_AND_TRIG,
-            'functionCall' => [MathTrig\Absolute::class, 'evaluate'],
-            'argumentCount' => '1',
-        ],
-        'ACCRINT' => [
-            'category' => Category::CATEGORY_FINANCIAL,
-            'functionCall' => [Financial\Securities\AccruedInterest::class, 'periodic'],
-            'argumentCount' => '4-8',
-        ],
-        'ACCRINTM' => [
-            'category' => Category::CATEGORY_FINANCIAL,
-            'functionCall' => [Financial\Securities\AccruedInterest::class, 'atMaturity'],
-            'argumentCount' => '3-5',
-        ],
-        'ACOS' => [
-            'category' => Category::CATEGORY_MATH_AND_TRIG,
-            'functionCall' => [MathTrig\Trig\Cosine::class, 'acos'],
-            'argumentCount' => '1',
-        ],
-        'ACOSH' => [
-            'category' => Category::CATEGORY_MATH_AND_TRIG,
-            'functionCall' => [MathTrig\Trig\Cosine::class, 'acosh'],
-            'argumentCount' => '1',
-        ],
-        'ACOT' => [
-            'category' => Category::CATEGORY_MATH_AND_TRIG,
-            'functionCall' => [MathTrig\Trig\Cotangent::class, 'acot'],
-            'argumentCount' => '1',
-        ],
-        'ACOTH' => [
-            'category' => Category::CATEGORY_MATH_AND_TRIG,
-            'functionCall' => [MathTrig\Trig\Cotangent::class, 'acoth'],
-            'argumentCount' => '1',
-        ],
-        'ADDRESS' => [
-            'category' => Category::CATEGORY_LOOKUP_AND_REFERENCE,
-            'functionCall' => [LookupRef\Address::class, 'cell'],
-            'argumentCount' => '2-5',
-        ],
-        'AGGREGATE' => [
-            'category' => Category::CATEGORY_MATH_AND_TRIG,
-            'functionCall' => [Functions::class, 'DUMMY'],
-            'argumentCount' => '3+',
-        ],
-        'AMORDEGRC' => [
-            'category' => Category::CATEGORY_FINANCIAL,
-            'functionCall' => [Financial\Amortization::class, 'AMORDEGRC'],
-            'argumentCount' => '6,7',
-        ],
-        'AMORLINC' => [
-            'category' => Category::CATEGORY_FINANCIAL,
-            'functionCall' => [Financial\Amortization::class, 'AMORLINC'],
-            'argumentCount' => '6,7',
-        ],
-        'ANCHORARRAY' => [
-            'category' => Category::CATEGORY_MICROSOFT_INTERNAL,
-            'functionCall' => [Internal\ExcelArrayPseudoFunctions::class, 'anchorArray'],
-            'argumentCount' => '1',
-            'passCellReference' => true,
-            'passByReference' => [true],
-        ],
-        'AND' => [
-            'category' => Category::CATEGORY_LOGICAL,
-            'functionCall' => [Logical\Operations::class, 'logicalAnd'],
-            'argumentCount' => '1+',
-        ],
-        'ARABIC' => [
-            'category' => Category::CATEGORY_MATH_AND_TRIG,
-            'functionCall' => [MathTrig\Arabic::class, 'evaluate'],
-            'argumentCount' => '1',
-        ],
-        'AREAS' => [
-            'category' => Category::CATEGORY_LOOKUP_AND_REFERENCE,
-            'functionCall' => [Functions::class, 'DUMMY'],
-            'argumentCount' => '1',
-        ],
-        'ARRAYTOTEXT' => [
-            'category' => Category::CATEGORY_TEXT_AND_DATA,
-            'functionCall' => [TextData\Text::class, 'fromArray'],
-            'argumentCount' => '1,2',
-        ],
-        'ASC' => [
-            'category' => Category::CATEGORY_TEXT_AND_DATA,
-            'functionCall' => [Functions::class, 'DUMMY'],
-            'argumentCount' => '1',
-        ],
-        'ASIN' => [
-            'category' => Category::CATEGORY_MATH_AND_TRIG,
-            'functionCall' => [MathTrig\Trig\Sine::class, 'asin'],
-            'argumentCount' => '1',
-        ],
-        'ASINH' => [
-            'category' => Category::CATEGORY_MATH_AND_TRIG,
-            'functionCall' => [MathTrig\Trig\Sine::class, 'asinh'],
-            'argumentCount' => '1',
-        ],
-        'ATAN' => [
-            'category' => Category::CATEGORY_MATH_AND_TRIG,
-            'functionCall' => [MathTrig\Trig\Tangent::class, 'atan'],
-            'argumentCount' => '1',
-        ],
-        'ATAN2' => [
-            'category' => Category::CATEGORY_MATH_AND_TRIG,
-            'functionCall' => [MathTrig\Trig\Tangent::class, 'atan2'],
-            'argumentCount' => '2',
-        ],
-        'ATANH' => [
-            'category' => Category::CATEGORY_MATH_AND_TRIG,
-            'functionCall' => [MathTrig\Trig\Tangent::class, 'atanh'],
-            'argumentCount' => '1',
-        ],
-        'AVEDEV' => [
-            'category' => Category::CATEGORY_STATISTICAL,
-            'functionCall' => [Statistical\Averages::class, 'averageDeviations'],
-            'argumentCount' => '1+',
-        ],
-        'AVERAGE' => [
-            'category' => Category::CATEGORY_STATISTICAL,
-            'functionCall' => [Statistical\Averages::class, 'average'],
-            'argumentCount' => '1+',
-        ],
-        'AVERAGEA' => [
-            'category' => Category::CATEGORY_STATISTICAL,
-            'functionCall' => [Statistical\Averages::class, 'averageA'],
-            'argumentCount' => '1+',
-        ],
-        'AVERAGEIF' => [
-            'category' => Category::CATEGORY_STATISTICAL,
-            'functionCall' => [Statistical\Conditional::class, 'AVERAGEIF'],
-            'argumentCount' => '2,3',
-        ],
-        'AVERAGEIFS' => [
-            'category' => Category::CATEGORY_STATISTICAL,
-            'functionCall' => [Statistical\Conditional::class, 'AVERAGEIFS'],
-            'argumentCount' => '3+',
-        ],
-        'BAHTTEXT' => [
-            'category' => Category::CATEGORY_TEXT_AND_DATA,
-            'functionCall' => [Functions::class, 'DUMMY'],
-            'argumentCount' => '1',
-        ],
-        'BASE' => [
-            'category' => Category::CATEGORY_MATH_AND_TRIG,
-            'functionCall' => [MathTrig\Base::class, 'evaluate'],
-            'argumentCount' => '2,3',
-        ],
-        'BESSELI' => [
-            'category' => Category::CATEGORY_ENGINEERING,
-            'functionCall' => [Engineering\BesselI::class, 'BESSELI'],
-            'argumentCount' => '2',
-        ],
-        'BESSELJ' => [
-            'category' => Category::CATEGORY_ENGINEERING,
-            'functionCall' => [Engineering\BesselJ::class, 'BESSELJ'],
-            'argumentCount' => '2',
-        ],
-        'BESSELK' => [
-            'category' => Category::CATEGORY_ENGINEERING,
-            'functionCall' => [Engineering\BesselK::class, 'BESSELK'],
-            'argumentCount' => '2',
-        ],
-        'BESSELY' => [
-            'category' => Category::CATEGORY_ENGINEERING,
-            'functionCall' => [Engineering\BesselY::class, 'BESSELY'],
-            'argumentCount' => '2',
-        ],
-        'BETADIST' => [
-            'category' => Category::CATEGORY_STATISTICAL,
-            'functionCall' => [Statistical\Distributions\Beta::class, 'distribution'],
-            'argumentCount' => '3-5',
-        ],
-        'BETA.DIST' => [
-            'category' => Category::CATEGORY_STATISTICAL,
-            'functionCall' => [Functions::class, 'DUMMY'],
-            'argumentCount' => '4-6',
-        ],
-        'BETAINV' => [
-            'category' => Category::CATEGORY_STATISTICAL,
-            'functionCall' => [Statistical\Distributions\Beta::class, 'inverse'],
-            'argumentCount' => '3-5',
-        ],
-        'BETA.INV' => [
-            'category' => Category::CATEGORY_STATISTICAL,
-            'functionCall' => [Statistical\Distributions\Beta::class, 'inverse'],
-            'argumentCount' => '3-5',
-        ],
-        'BIN2DEC' => [
-            'category' => Category::CATEGORY_ENGINEERING,
-            'functionCall' => [Engineering\ConvertBinary::class, 'toDecimal'],
-            'argumentCount' => '1',
-        ],
-        'BIN2HEX' => [
-            'category' => Category::CATEGORY_ENGINEERING,
-            'functionCall' => [Engineering\ConvertBinary::class, 'toHex'],
-            'argumentCount' => '1,2',
-        ],
-        'BIN2OCT' => [
-            'category' => Category::CATEGORY_ENGINEERING,
-            'functionCall' => [Engineering\ConvertBinary::class, 'toOctal'],
-            'argumentCount' => '1,2',
-        ],
-        'BINOMDIST' => [
-            'category' => Category::CATEGORY_STATISTICAL,
-            'functionCall' => [Statistical\Distributions\Binomial::class, 'distribution'],
-            'argumentCount' => '4',
-        ],
-        'BINOM.DIST' => [
-            'category' => Category::CATEGORY_STATISTICAL,
-            'functionCall' => [Statistical\Distributions\Binomial::class, 'distribution'],
-            'argumentCount' => '4',
-        ],
-        'BINOM.DIST.RANGE' => [
-            'category' => Category::CATEGORY_STATISTICAL,
-            'functionCall' => [Statistical\Distributions\Binomial::class, 'range'],
-            'argumentCount' => '3,4',
-        ],
-        'BINOM.INV' => [
-            'category' => Category::CATEGORY_STATISTICAL,
-            'functionCall' => [Statistical\Distributions\Binomial::class, 'inverse'],
-            'argumentCount' => '3',
-        ],
-        'BITAND' => [
-            'category' => Category::CATEGORY_ENGINEERING,
-            'functionCall' => [Engineering\BitWise::class, 'BITAND'],
-            'argumentCount' => '2',
-        ],
-        'BITOR' => [
-            'category' => Category::CATEGORY_ENGINEERING,
-            'functionCall' => [Engineering\BitWise::class, 'BITOR'],
-            'argumentCount' => '2',
-        ],
-        'BITXOR' => [
-            'category' => Category::CATEGORY_ENGINEERING,
-            'functionCall' => [Engineering\BitWise::class, 'BITXOR'],
-            'argumentCount' => '2',
-        ],
-        'BITLSHIFT' => [
-            'category' => Category::CATEGORY_ENGINEERING,
-            'functionCall' => [Engineering\BitWise::class, 'BITLSHIFT'],
-            'argumentCount' => '2',
-        ],
-        'BITRSHIFT' => [
-            'category' => Category::CATEGORY_ENGINEERING,
-            'functionCall' => [Engineering\BitWise::class, 'BITRSHIFT'],
-            'argumentCount' => '2',
-        ],
-        'BYCOL' => [
-            'category' => Category::CATEGORY_LOGICAL,
-            'functionCall' => [Functions::class, 'DUMMY'],
-            'argumentCount' => '*',
-        ],
-        'BYROW' => [
-            'category' => Category::CATEGORY_LOGICAL,
-            'functionCall' => [Functions::class, 'DUMMY'],
-            'argumentCount' => '*',
-        ],
-        'CEILING' => [
-            'category' => Category::CATEGORY_MATH_AND_TRIG,
-            'functionCall' => [MathTrig\Ceiling::class, 'ceiling'],
-            'argumentCount' => '1-2', // 2 for Excel, 1-2 for Ods/Gnumeric
-        ],
-        'CEILING.MATH' => [
-            'category' => Category::CATEGORY_MATH_AND_TRIG,
-            'functionCall' => [MathTrig\Ceiling::class, 'math'],
-            'argumentCount' => '1-3',
-        ],
-        'CEILING.PRECISE' => [
-            'category' => Category::CATEGORY_MATH_AND_TRIG,
-            'functionCall' => [MathTrig\Ceiling::class, 'precise'],
-            'argumentCount' => '1,2',
-        ],
-        'CELL' => [
-            'category' => Category::CATEGORY_INFORMATION,
-            'functionCall' => [Functions::class, 'DUMMY'],
-            'argumentCount' => '1,2',
-        ],
-        'CHAR' => [
-            'category' => Category::CATEGORY_TEXT_AND_DATA,
-            'functionCall' => [TextData\CharacterConvert::class, 'character'],
-            'argumentCount' => '1',
-        ],
-        'CHIDIST' => [
-            'category' => Category::CATEGORY_STATISTICAL,
-            'functionCall' => [Statistical\Distributions\ChiSquared::class, 'distributionRightTail'],
-            'argumentCount' => '2',
-        ],
-        'CHISQ.DIST' => [
-            'category' => Category::CATEGORY_STATISTICAL,
-            'functionCall' => [Statistical\Distributions\ChiSquared::class, 'distributionLeftTail'],
-            'argumentCount' => '3',
-        ],
-        'CHISQ.DIST.RT' => [
-            'category' => Category::CATEGORY_STATISTICAL,
-            'functionCall' => [Statistical\Distributions\ChiSquared::class, 'distributionRightTail'],
-            'argumentCount' => '2',
-        ],
-        'CHIINV' => [
-            'category' => Category::CATEGORY_STATISTICAL,
-            'functionCall' => [Statistical\Distributions\ChiSquared::class, 'inverseRightTail'],
-            'argumentCount' => '2',
-        ],
-        'CHISQ.INV' => [
-            'category' => Category::CATEGORY_STATISTICAL,
-            'functionCall' => [Statistical\Distributions\ChiSquared::class, 'inverseLeftTail'],
-            'argumentCount' => '2',
-        ],
-        'CHISQ.INV.RT' => [
-            'category' => Category::CATEGORY_STATISTICAL,
-            'functionCall' => [Statistical\Distributions\ChiSquared::class, 'inverseRightTail'],
-            'argumentCount' => '2',
-        ],
-        'CHITEST' => [
-            'category' => Category::CATEGORY_STATISTICAL,
-            'functionCall' => [Statistical\Distributions\ChiSquared::class, 'test'],
-            'argumentCount' => '2',
-        ],
-        'CHISQ.TEST' => [
-            'category' => Category::CATEGORY_STATISTICAL,
-            'functionCall' => [Statistical\Distributions\ChiSquared::class, 'test'],
-            'argumentCount' => '2',
-        ],
-        'CHOOSE' => [
-            'category' => Category::CATEGORY_LOOKUP_AND_REFERENCE,
-            'functionCall' => [LookupRef\Selection::class, 'CHOOSE'],
-            'argumentCount' => '2+',
-        ],
-        'CHOOSECOLS' => [
-            'category' => Category::CATEGORY_LOOKUP_AND_REFERENCE,
-            'functionCall' => [LookupRef\ChooseRowsEtc::class, 'chooseCols'],
-            'argumentCount' => '2+',
-        ],
-        'CHOOSEROWS' => [
-            'category' => Category::CATEGORY_LOOKUP_AND_REFERENCE,
-            'functionCall' => [LookupRef\ChooseRowsEtc::class, 'chooseRows'],
-            'argumentCount' => '2+',
-        ],
-        'CLEAN' => [
-            'category' => Category::CATEGORY_TEXT_AND_DATA,
-            'functionCall' => [TextData\Trim::class, 'nonPrintable'],
-            'argumentCount' => '1',
-        ],
-        'CODE' => [
-            'category' => Category::CATEGORY_TEXT_AND_DATA,
-            'functionCall' => [TextData\CharacterConvert::class, 'code'],
-            'argumentCount' => '1',
-        ],
-        'COLUMN' => [
-            'category' => Category::CATEGORY_LOOKUP_AND_REFERENCE,
-            'functionCall' => [LookupRef\RowColumnInformation::class, 'COLUMN'],
-            'argumentCount' => '-1',
-            'passCellReference' => true,
-            'passByReference' => [true],
-        ],
-        'COLUMNS' => [
-            'category' => Category::CATEGORY_LOOKUP_AND_REFERENCE,
-            'functionCall' => [LookupRef\RowColumnInformation::class, 'COLUMNS'],
-            'argumentCount' => '1',
-        ],
-        'COMBIN' => [
-            'category' => Category::CATEGORY_MATH_AND_TRIG,
-            'functionCall' => [MathTrig\Combinations::class, 'withoutRepetition'],
-            'argumentCount' => '2',
-        ],
-        'COMBINA' => [
-            'category' => Category::CATEGORY_MATH_AND_TRIG,
-            'functionCall' => [MathTrig\Combinations::class, 'withRepetition'],
-            'argumentCount' => '2',
-        ],
-        'COMPLEX' => [
-            'category' => Category::CATEGORY_ENGINEERING,
-            'functionCall' => [Engineering\Complex::class, 'COMPLEX'],
-            'argumentCount' => '2,3',
-        ],
-        'CONCAT' => [
-            'category' => Category::CATEGORY_TEXT_AND_DATA,
-            'functionCall' => [TextData\Concatenate::class, 'CONCATENATE'],
-            'argumentCount' => '1+',
-        ],
-        'CONCATENATE' => [
-            'category' => Category::CATEGORY_TEXT_AND_DATA,
-            'functionCall' => [TextData\Concatenate::class, 'actualCONCATENATE'],
-            'argumentCount' => '1+',
-        ],
-        'CONFIDENCE' => [
-            'category' => Category::CATEGORY_STATISTICAL,
-            'functionCall' => [Statistical\Confidence::class, 'CONFIDENCE'],
-            'argumentCount' => '3',
-        ],
-        'CONFIDENCE.NORM' => [
-            'category' => Category::CATEGORY_STATISTICAL,
-            'functionCall' => [Statistical\Confidence::class, 'CONFIDENCE'],
-            'argumentCount' => '3',
-        ],
-        'CONFIDENCE.T' => [
-            'category' => Category::CATEGORY_STATISTICAL,
-            'functionCall' => [Functions::class, 'DUMMY'],
-            'argumentCount' => '3',
-        ],
-        'CONVERT' => [
-            'category' => Category::CATEGORY_ENGINEERING,
-            'functionCall' => [Engineering\ConvertUOM::class, 'CONVERT'],
-            'argumentCount' => '3',
-        ],
-        'CORREL' => [
-            'category' => Category::CATEGORY_STATISTICAL,
-            'functionCall' => [Statistical\Trends::class, 'CORREL'],
-            'argumentCount' => '2',
-        ],
-        'COS' => [
-            'category' => Category::CATEGORY_MATH_AND_TRIG,
-            'functionCall' => [MathTrig\Trig\Cosine::class, 'cos'],
-            'argumentCount' => '1',
-        ],
-        'COSH' => [
-            'category' => Category::CATEGORY_MATH_AND_TRIG,
-            'functionCall' => [MathTrig\Trig\Cosine::class, 'cosh'],
-            'argumentCount' => '1',
-        ],
-        'COT' => [
-            'category' => Category::CATEGORY_MATH_AND_TRIG,
-            'functionCall' => [MathTrig\Trig\Cotangent::class, 'cot'],
-            'argumentCount' => '1',
-        ],
-        'COTH' => [
-            'category' => Category::CATEGORY_MATH_AND_TRIG,
-            'functionCall' => [MathTrig\Trig\Cotangent::class, 'coth'],
-            'argumentCount' => '1',
-        ],
-        'COUNT' => [
-            'category' => Category::CATEGORY_STATISTICAL,
-            'functionCall' => [Statistical\Counts::class, 'COUNT'],
-            'argumentCount' => '1+',
-        ],
-        'COUNTA' => [
-            'category' => Category::CATEGORY_STATISTICAL,
-            'functionCall' => [Statistical\Counts::class, 'COUNTA'],
-            'argumentCount' => '1+',
-        ],
-        'COUNTBLANK' => [
-            'category' => Category::CATEGORY_STATISTICAL,
-            'functionCall' => [Statistical\Counts::class, 'COUNTBLANK'],
-            'argumentCount' => '1',
-        ],
-        'COUNTIF' => [
-            'category' => Category::CATEGORY_STATISTICAL,
-            'functionCall' => [Statistical\Conditional::class, 'COUNTIF'],
-            'argumentCount' => '2',
-        ],
-        'COUNTIFS' => [
-            'category' => Category::CATEGORY_STATISTICAL,
-            'functionCall' => [Statistical\Conditional::class, 'COUNTIFS'],
-            'argumentCount' => '2+',
-        ],
-        'COUPDAYBS' => [
-            'category' => Category::CATEGORY_FINANCIAL,
-            'functionCall' => [Financial\Coupons::class, 'COUPDAYBS'],
-            'argumentCount' => '3,4',
-        ],
-        'COUPDAYS' => [
-            'category' => Category::CATEGORY_FINANCIAL,
-            'functionCall' => [Financial\Coupons::class, 'COUPDAYS'],
-            'argumentCount' => '3,4',
-        ],
-        'COUPDAYSNC' => [
-            'category' => Category::CATEGORY_FINANCIAL,
-            'functionCall' => [Financial\Coupons::class, 'COUPDAYSNC'],
-            'argumentCount' => '3,4',
-        ],
-        'COUPNCD' => [
-            'category' => Category::CATEGORY_FINANCIAL,
-            'functionCall' => [Financial\Coupons::class, 'COUPNCD'],
-            'argumentCount' => '3,4',
-        ],
-        'COUPNUM' => [
-            'category' => Category::CATEGORY_FINANCIAL,
-            'functionCall' => [Financial\Coupons::class, 'COUPNUM'],
-            'argumentCount' => '3,4',
-        ],
-        'COUPPCD' => [
-            'category' => Category::CATEGORY_FINANCIAL,
-            'functionCall' => [Financial\Coupons::class, 'COUPPCD'],
-            'argumentCount' => '3,4',
-        ],
-        'COVAR' => [
-            'category' => Category::CATEGORY_STATISTICAL,
-            'functionCall' => [Statistical\Trends::class, 'COVAR'],
-            'argumentCount' => '2',
-        ],
-        'COVARIANCE.P' => [
-            'category' => Category::CATEGORY_STATISTICAL,
-            'functionCall' => [Statistical\Trends::class, 'COVAR'],
-            'argumentCount' => '2',
-        ],
-        'COVARIANCE.S' => [
-            'category' => Category::CATEGORY_STATISTICAL,
-            'functionCall' => [Functions::class, 'DUMMY'],
-            'argumentCount' => '2',
-        ],
-        'CRITBINOM' => [
-            'category' => Category::CATEGORY_STATISTICAL,
-            'functionCall' => [Statistical\Distributions\Binomial::class, 'inverse'],
-            'argumentCount' => '3',
-        ],
-        'CSC' => [
-            'category' => Category::CATEGORY_MATH_AND_TRIG,
-            'functionCall' => [MathTrig\Trig\Cosecant::class, 'csc'],
-            'argumentCount' => '1',
-        ],
-        'CSCH' => [
-            'category' => Category::CATEGORY_MATH_AND_TRIG,
-            'functionCall' => [MathTrig\Trig\Cosecant::class, 'csch'],
-            'argumentCount' => '1',
-        ],
-        'CUBEKPIMEMBER' => [
-            'category' => Category::CATEGORY_CUBE,
-            'functionCall' => [Functions::class, 'DUMMY'],
-            'argumentCount' => '?',
-        ],
-        'CUBEMEMBER' => [
-            'category' => Category::CATEGORY_CUBE,
-            'functionCall' => [Functions::class, 'DUMMY'],
-            'argumentCount' => '?',
-        ],
-        'CUBEMEMBERPROPERTY' => [
-            'category' => Category::CATEGORY_CUBE,
-            'functionCall' => [Functions::class, 'DUMMY'],
-            'argumentCount' => '?',
-        ],
-        'CUBERANKEDMEMBER' => [
-            'category' => Category::CATEGORY_CUBE,
-            'functionCall' => [Functions::class, 'DUMMY'],
-            'argumentCount' => '?',
-        ],
-        'CUBESET' => [
-            'category' => Category::CATEGORY_CUBE,
-            'functionCall' => [Functions::class, 'DUMMY'],
-            'argumentCount' => '?',
-        ],
-        'CUBESETCOUNT' => [
-            'category' => Category::CATEGORY_CUBE,
-            'functionCall' => [Functions::class, 'DUMMY'],
-            'argumentCount' => '?',
-        ],
-        'CUBEVALUE' => [
-            'category' => Category::CATEGORY_CUBE,
-            'functionCall' => [Functions::class, 'DUMMY'],
-            'argumentCount' => '?',
-        ],
-        'CUMIPMT' => [
-            'category' => Category::CATEGORY_FINANCIAL,
-            'functionCall' => [Financial\CashFlow\Constant\Periodic\Cumulative::class, 'interest'],
-            'argumentCount' => '6',
-        ],
-        'CUMPRINC' => [
-            'category' => Category::CATEGORY_FINANCIAL,
-            'functionCall' => [Financial\CashFlow\Constant\Periodic\Cumulative::class, 'principal'],
-            'argumentCount' => '6',
-        ],
-        'DATE' => [
-            'category' => Category::CATEGORY_DATE_AND_TIME,
-            'functionCall' => [DateTimeExcel\Date::class, 'fromYMD'],
-            'argumentCount' => '3',
-        ],
-        'DATEDIF' => [
-            'category' => Category::CATEGORY_DATE_AND_TIME,
-            'functionCall' => [DateTimeExcel\Difference::class, 'interval'],
-            'argumentCount' => '2,3',
-        ],
-        'DATESTRING' => [
-            'category' => Category::CATEGORY_DATE_AND_TIME,
-            'functionCall' => [Functions::class, 'DUMMY'],
-            'argumentCount' => '?',
-        ],
-        'DATEVALUE' => [
-            'category' => Category::CATEGORY_DATE_AND_TIME,
-            'functionCall' => [DateTimeExcel\DateValue::class, 'fromString'],
-            'argumentCount' => '1',
-        ],
-        'DAVERAGE' => [
-            'category' => Category::CATEGORY_DATABASE,
-            'functionCall' => [Database\DAverage::class, 'evaluate'],
-            'argumentCount' => '3',
-        ],
-        'DAY' => [
-            'category' => Category::CATEGORY_DATE_AND_TIME,
-            'functionCall' => [DateTimeExcel\DateParts::class, 'day'],
-            'argumentCount' => '1',
-        ],
-        'DAYS' => [
-            'category' => Category::CATEGORY_DATE_AND_TIME,
-            'functionCall' => [DateTimeExcel\Days::class, 'between'],
-            'argumentCount' => '2',
-        ],
-        'DAYS360' => [
-            'category' => Category::CATEGORY_DATE_AND_TIME,
-            'functionCall' => [DateTimeExcel\Days360::class, 'between'],
-            'argumentCount' => '2,3',
-        ],
-        'DB' => [
-            'category' => Category::CATEGORY_FINANCIAL,
-            'functionCall' => [Financial\Depreciation::class, 'DB'],
-            'argumentCount' => '4,5',
-        ],
-        'DBCS' => [
-            'category' => Category::CATEGORY_TEXT_AND_DATA,
-            'functionCall' => [Functions::class, 'DUMMY'],
-            'argumentCount' => '1',
-        ],
-        'DCOUNT' => [
-            'category' => Category::CATEGORY_DATABASE,
-            'functionCall' => [Database\DCount::class, 'evaluate'],
-            'argumentCount' => '3',
-        ],
-        'DCOUNTA' => [
-            'category' => Category::CATEGORY_DATABASE,
-            'functionCall' => [Database\DCountA::class, 'evaluate'],
-            'argumentCount' => '3',
-        ],
-        'DDB' => [
-            'category' => Category::CATEGORY_FINANCIAL,
-            'functionCall' => [Financial\Depreciation::class, 'DDB'],
-            'argumentCount' => '4,5',
-        ],
-        'DEC2BIN' => [
-            'category' => Category::CATEGORY_ENGINEERING,
-            'functionCall' => [Engineering\ConvertDecimal::class, 'toBinary'],
-            'argumentCount' => '1,2',
-        ],
-        'DEC2HEX' => [
-            'category' => Category::CATEGORY_ENGINEERING,
-            'functionCall' => [Engineering\ConvertDecimal::class, 'toHex'],
-            'argumentCount' => '1,2',
-        ],
-        'DEC2OCT' => [
-            'category' => Category::CATEGORY_ENGINEERING,
-            'functionCall' => [Engineering\ConvertDecimal::class, 'toOctal'],
-            'argumentCount' => '1,2',
-        ],
-        'DECIMAL' => [
-            'category' => Category::CATEGORY_MATH_AND_TRIG,
-            'functionCall' => [Functions::class, 'DUMMY'],
-            'argumentCount' => '2',
-        ],
-        'DEGREES' => [
-            'category' => Category::CATEGORY_MATH_AND_TRIG,
-            'functionCall' => [MathTrig\Angle::class, 'toDegrees'],
-            'argumentCount' => '1',
-        ],
-        'DELTA' => [
-            'category' => Category::CATEGORY_ENGINEERING,
-            'functionCall' => [Engineering\Compare::class, 'DELTA'],
-            'argumentCount' => '1,2',
-        ],
-        'DEVSQ' => [
-            'category' => Category::CATEGORY_STATISTICAL,
-            'functionCall' => [Statistical\Deviations::class, 'sumSquares'],
-            'argumentCount' => '1+',
-        ],
-        'DGET' => [
-            'category' => Category::CATEGORY_DATABASE,
-            'functionCall' => [Database\DGet::class, 'evaluate'],
-            'argumentCount' => '3',
-        ],
-        'DISC' => [
-            'category' => Category::CATEGORY_FINANCIAL,
-            'functionCall' => [Financial\Securities\Rates::class, 'discount'],
-            'argumentCount' => '4,5',
-        ],
-        'DMAX' => [
-            'category' => Category::CATEGORY_DATABASE,
-            'functionCall' => [Database\DMax::class, 'evaluate'],
-            'argumentCount' => '3',
-        ],
-        'DMIN' => [
-            'category' => Category::CATEGORY_DATABASE,
-            'functionCall' => [Database\DMin::class, 'evaluate'],
-            'argumentCount' => '3',
-        ],
-        'DOLLAR' => [
-            'category' => Category::CATEGORY_TEXT_AND_DATA,
-            'functionCall' => [TextData\Format::class, 'DOLLAR'],
-            'argumentCount' => '1,2',
-        ],
-        'DOLLARDE' => [
-            'category' => Category::CATEGORY_FINANCIAL,
-            'functionCall' => [Financial\Dollar::class, 'decimal'],
-            'argumentCount' => '2',
-        ],
-        'DOLLARFR' => [
-            'category' => Category::CATEGORY_FINANCIAL,
-            'functionCall' => [Financial\Dollar::class, 'fractional'],
-            'argumentCount' => '2',
-        ],
-        'DPRODUCT' => [
-            'category' => Category::CATEGORY_DATABASE,
-            'functionCall' => [Database\DProduct::class, 'evaluate'],
-            'argumentCount' => '3',
-        ],
-        'DROP' => [
-            'category' => Category::CATEGORY_LOOKUP_AND_REFERENCE,
-            'functionCall' => [LookupRef\ChooseRowsEtc::class, 'drop'],
-            'argumentCount' => '2-3',
-        ],
-        'DSTDEV' => [
-            'category' => Category::CATEGORY_DATABASE,
-            'functionCall' => [Database\DStDev::class, 'evaluate'],
-            'argumentCount' => '3',
-        ],
-        'DSTDEVP' => [
-            'category' => Category::CATEGORY_DATABASE,
-            'functionCall' => [Database\DStDevP::class, 'evaluate'],
-            'argumentCount' => '3',
-        ],
-        'DSUM' => [
-            'category' => Category::CATEGORY_DATABASE,
-            'functionCall' => [Database\DSum::class, 'evaluate'],
-            'argumentCount' => '3',
-        ],
-        'DURATION' => [
-            'category' => Category::CATEGORY_FINANCIAL,
-            'functionCall' => [Functions::class, 'DUMMY'],
-            'argumentCount' => '5,6',
-        ],
-        'DVAR' => [
-            'category' => Category::CATEGORY_DATABASE,
-            'functionCall' => [Database\DVar::class, 'evaluate'],
-            'argumentCount' => '3',
-        ],
-        'DVARP' => [
-            'category' => Category::CATEGORY_DATABASE,
-            'functionCall' => [Database\DVarP::class, 'evaluate'],
-            'argumentCount' => '3',
-        ],
-        'ECMA.CEILING' => [
-            'category' => Category::CATEGORY_MATH_AND_TRIG,
-            'functionCall' => [Functions::class, 'DUMMY'],
-            'argumentCount' => '1,2',
-        ],
-        'EDATE' => [
-            'category' => Category::CATEGORY_DATE_AND_TIME,
-            'functionCall' => [DateTimeExcel\Month::class, 'adjust'],
-            'argumentCount' => '2',
-        ],
-        'EFFECT' => [
-            'category' => Category::CATEGORY_FINANCIAL,
-            'functionCall' => [Financial\InterestRate::class, 'effective'],
-            'argumentCount' => '2',
-        ],
-        'ENCODEURL' => [
-            'category' => Category::CATEGORY_WEB,
-            'functionCall' => [Web\Service::class, 'urlEncode'],
-            'argumentCount' => '1',
-        ],
-        'EOMONTH' => [
-            'category' => Category::CATEGORY_DATE_AND_TIME,
-            'functionCall' => [DateTimeExcel\Month::class, 'lastDay'],
-            'argumentCount' => '2',
-        ],
-        'ERF' => [
-            'category' => Category::CATEGORY_ENGINEERING,
-            'functionCall' => [Engineering\Erf::class, 'ERF'],
-            'argumentCount' => '1,2',
-        ],
-        'ERF.PRECISE' => [
-            'category' => Category::CATEGORY_ENGINEERING,
-            'functionCall' => [Engineering\Erf::class, 'ERFPRECISE'],
-            'argumentCount' => '1',
-        ],
-        'ERFC' => [
-            'category' => Category::CATEGORY_ENGINEERING,
-            'functionCall' => [Engineering\ErfC::class, 'ERFC'],
-            'argumentCount' => '1',
-        ],
-        'ERFC.PRECISE' => [
-            'category' => Category::CATEGORY_ENGINEERING,
-            'functionCall' => [Engineering\ErfC::class, 'ERFC'],
-            'argumentCount' => '1',
-        ],
-        'ERROR.TYPE' => [
-            'category' => Category::CATEGORY_INFORMATION,
-            'functionCall' => [ExcelError::class, 'type'],
-            'argumentCount' => '1',
-        ],
-        'EVEN' => [
-            'category' => Category::CATEGORY_MATH_AND_TRIG,
-            'functionCall' => [MathTrig\Round::class, 'even'],
-            'argumentCount' => '1',
-        ],
-        'EXACT' => [
-            'category' => Category::CATEGORY_TEXT_AND_DATA,
-            'functionCall' => [TextData\Text::class, 'exact'],
-            'argumentCount' => '2',
-        ],
-        'EXP' => [
-            'category' => Category::CATEGORY_MATH_AND_TRIG,
-            'functionCall' => [MathTrig\Exp::class, 'evaluate'],
-            'argumentCount' => '1',
-        ],
-        'EXPAND' => [
-            'category' => Category::CATEGORY_LOOKUP_AND_REFERENCE,
-            'functionCall' => [LookupRef\ChooseRowsEtc::class, 'expand'],
-            'argumentCount' => '2-4',
-        ],
-        'EXPONDIST' => [
-            'category' => Category::CATEGORY_STATISTICAL,
-            'functionCall' => [Statistical\Distributions\Exponential::class, 'distribution'],
-            'argumentCount' => '3',
-        ],
-        'EXPON.DIST' => [
-            'category' => Category::CATEGORY_STATISTICAL,
-            'functionCall' => [Statistical\Distributions\Exponential::class, 'distribution'],
-            'argumentCount' => '3',
-        ],
-        'FACT' => [
-            'category' => Category::CATEGORY_MATH_AND_TRIG,
-            'functionCall' => [MathTrig\Factorial::class, 'fact'],
-            'argumentCount' => '1',
-        ],
-        'FACTDOUBLE' => [
-            'category' => Category::CATEGORY_MATH_AND_TRIG,
-            'functionCall' => [MathTrig\Factorial::class, 'factDouble'],
-            'argumentCount' => '1',
-        ],
-        'FALSE' => [
-            'category' => Category::CATEGORY_LOGICAL,
-            'functionCall' => [Logical\Boolean::class, 'FALSE'],
-            'argumentCount' => '0',
-        ],
-        'FDIST' => [
-            'category' => Category::CATEGORY_STATISTICAL,
-            'functionCall' => [Functions::class, 'DUMMY'],
-            'argumentCount' => '3',
-        ],
-        'F.DIST' => [
-            'category' => Category::CATEGORY_STATISTICAL,
-            'functionCall' => [Statistical\Distributions\F::class, 'distribution'],
-            'argumentCount' => '4',
-        ],
-        'F.DIST.RT' => [
-            'category' => Category::CATEGORY_STATISTICAL,
-            'functionCall' => [Functions::class, 'DUMMY'],
-            'argumentCount' => '3',
-        ],
-        'FILTER' => [
-            'category' => Category::CATEGORY_LOOKUP_AND_REFERENCE,
-            'functionCall' => [LookupRef\Filter::class, 'filter'],
-            'argumentCount' => '2-3',
-        ],
-        'FILTERXML' => [
-            'category' => Category::CATEGORY_WEB,
-            'functionCall' => [Functions::class, 'DUMMY'],
-            'argumentCount' => '2',
-        ],
-        'FIND' => [
-            'category' => Category::CATEGORY_TEXT_AND_DATA,
-            'functionCall' => [TextData\Search::class, 'sensitive'],
-            'argumentCount' => '2,3',
-        ],
-        'FINDB' => [
-            'category' => Category::CATEGORY_TEXT_AND_DATA,
-            'functionCall' => [TextData\Search::class, 'sensitive'],
-            'argumentCount' => '2,3',
-        ],
-        'FINV' => [
-            'category' => Category::CATEGORY_STATISTICAL,
-            'functionCall' => [Functions::class, 'DUMMY'],
-            'argumentCount' => '3',
-        ],
-        'F.INV' => [
-            'category' => Category::CATEGORY_STATISTICAL,
-            'functionCall' => [Functions::class, 'DUMMY'],
-            'argumentCount' => '3',
-        ],
-        'F.INV.RT' => [
-            'category' => Category::CATEGORY_STATISTICAL,
-            'functionCall' => [Functions::class, 'DUMMY'],
-            'argumentCount' => '3',
-        ],
-        'FISHER' => [
-            'category' => Category::CATEGORY_STATISTICAL,
-            'functionCall' => [Statistical\Distributions\Fisher::class, 'distribution'],
-            'argumentCount' => '1',
-        ],
-        'FISHERINV' => [
-            'category' => Category::CATEGORY_STATISTICAL,
-            'functionCall' => [Statistical\Distributions\Fisher::class, 'inverse'],
-            'argumentCount' => '1',
-        ],
-        'FIXED' => [
-            'category' => Category::CATEGORY_TEXT_AND_DATA,
-            'functionCall' => [TextData\Format::class, 'FIXEDFORMAT'],
-            'argumentCount' => '1-3',
-        ],
-        'FLOOR' => [
-            'category' => Category::CATEGORY_MATH_AND_TRIG,
-            'functionCall' => [MathTrig\Floor::class, 'floor'],
-            'argumentCount' => '1-2', // Excel requries 2, Ods/Gnumeric 1-2
-        ],
-        'FLOOR.MATH' => [
-            'category' => Category::CATEGORY_MATH_AND_TRIG,
-            'functionCall' => [MathTrig\Floor::class, 'math'],
-            'argumentCount' => '1-3',
-        ],
-        'FLOOR.PRECISE' => [
-            'category' => Category::CATEGORY_MATH_AND_TRIG,
-            'functionCall' => [MathTrig\Floor::class, 'precise'],
-            'argumentCount' => '1-2',
-        ],
-        'FORECAST' => [
-            'category' => Category::CATEGORY_STATISTICAL,
-            'functionCall' => [Statistical\Trends::class, 'FORECAST'],
-            'argumentCount' => '3',
-        ],
-        'FORECAST.ETS' => [
-            'category' => Category::CATEGORY_STATISTICAL,
-            'functionCall' => [Functions::class, 'DUMMY'],
-            'argumentCount' => '3-6',
-        ],
-        'FORECAST.ETS.CONFINT' => [
-            'category' => Category::CATEGORY_STATISTICAL,
-            'functionCall' => [Functions::class, 'DUMMY'],
-            'argumentCount' => '3-6',
-        ],
-        'FORECAST.ETS.SEASONALITY' => [
-            'category' => Category::CATEGORY_STATISTICAL,
-            'functionCall' => [Functions::class, 'DUMMY'],
-            'argumentCount' => '2-4',
-        ],
-        'FORECAST.ETS.STAT' => [
-            'category' => Category::CATEGORY_STATISTICAL,
-            'functionCall' => [Functions::class, 'DUMMY'],
-            'argumentCount' => '3-6',
-        ],
-        'FORECAST.LINEAR' => [
-            'category' => Category::CATEGORY_STATISTICAL,
-            'functionCall' => [Statistical\Trends::class, 'FORECAST'],
-            'argumentCount' => '3',
-        ],
-        'FORMULATEXT' => [
-            'category' => Category::CATEGORY_LOOKUP_AND_REFERENCE,
-            'functionCall' => [LookupRef\Formula::class, 'text'],
-            'argumentCount' => '1',
-            'passCellReference' => true,
-            'passByReference' => [true],
-        ],
-        'FREQUENCY' => [
-            'category' => Category::CATEGORY_STATISTICAL,
-            'functionCall' => [Functions::class, 'DUMMY'],
-            'argumentCount' => '2',
-        ],
-        'FTEST' => [
-            'category' => Category::CATEGORY_STATISTICAL,
-            'functionCall' => [Functions::class, 'DUMMY'],
-            'argumentCount' => '2',
-        ],
-        'F.TEST' => [
-            'category' => Category::CATEGORY_STATISTICAL,
-            'functionCall' => [Functions::class, 'DUMMY'],
-            'argumentCount' => '2',
-        ],
-        'FV' => [
-            'category' => Category::CATEGORY_FINANCIAL,
-            'functionCall' => [Financial\CashFlow\Constant\Periodic::class, 'futureValue'],
-            'argumentCount' => '3-5',
-        ],
-        'FVSCHEDULE' => [
-            'category' => Category::CATEGORY_FINANCIAL,
-            'functionCall' => [Financial\CashFlow\Single::class, 'futureValue'],
-            'argumentCount' => '2',
-        ],
-        'GAMMA' => [
-            'category' => Category::CATEGORY_STATISTICAL,
-            'functionCall' => [Statistical\Distributions\Gamma::class, 'gamma'],
-            'argumentCount' => '1',
-        ],
-        'GAMMADIST' => [
-            'category' => Category::CATEGORY_STATISTICAL,
-            'functionCall' => [Statistical\Distributions\Gamma::class, 'distribution'],
-            'argumentCount' => '4',
-        ],
-        'GAMMA.DIST' => [
-            'category' => Category::CATEGORY_STATISTICAL,
-            'functionCall' => [Statistical\Distributions\Gamma::class, 'distribution'],
-            'argumentCount' => '4',
-        ],
-        'GAMMAINV' => [
-            'category' => Category::CATEGORY_STATISTICAL,
-            'functionCall' => [Statistical\Distributions\Gamma::class, 'inverse'],
-            'argumentCount' => '3',
-        ],
-        'GAMMA.INV' => [
-            'category' => Category::CATEGORY_STATISTICAL,
-            'functionCall' => [Statistical\Distributions\Gamma::class, 'inverse'],
-            'argumentCount' => '3',
-        ],
-        'GAMMALN' => [
-            'category' => Category::CATEGORY_STATISTICAL,
-            'functionCall' => [Statistical\Distributions\Gamma::class, 'ln'],
-            'argumentCount' => '1',
-        ],
-        'GAMMALN.PRECISE' => [
-            'category' => Category::CATEGORY_STATISTICAL,
-            'functionCall' => [Statistical\Distributions\Gamma::class, 'ln'],
-            'argumentCount' => '1',
-        ],
-        'GAUSS' => [
-            'category' => Category::CATEGORY_STATISTICAL,
-            'functionCall' => [Statistical\Distributions\StandardNormal::class, 'gauss'],
-            'argumentCount' => '1',
-        ],
-        'GCD' => [
-            'category' => Category::CATEGORY_MATH_AND_TRIG,
-            'functionCall' => [MathTrig\Gcd::class, 'evaluate'],
-            'argumentCount' => '1+',
-        ],
-        'GEOMEAN' => [
-            'category' => Category::CATEGORY_STATISTICAL,
-            'functionCall' => [Statistical\Averages\Mean::class, 'geometric'],
-            'argumentCount' => '1+',
-        ],
-        'GESTEP' => [
-            'category' => Category::CATEGORY_ENGINEERING,
-            'functionCall' => [Engineering\Compare::class, 'GESTEP'],
-            'argumentCount' => '1,2',
-        ],
-        'GETPIVOTDATA' => [
-            'category' => Category::CATEGORY_LOOKUP_AND_REFERENCE,
-            'functionCall' => [Functions::class, 'DUMMY'],
-            'argumentCount' => '2+',
-        ],
-        'GROUPBY' => [
-            'category' => Category::CATEGORY_LOOKUP_AND_REFERENCE,
-            'functionCall' => [Functions::class, 'DUMMY'],
-            'argumentCount' => '3-7',
-        ],
-        'GROWTH' => [
-            'category' => Category::CATEGORY_STATISTICAL,
-            'functionCall' => [Statistical\Trends::class, 'GROWTH'],
-            'argumentCount' => '1-4',
-        ],
-        'HARMEAN' => [
-            'category' => Category::CATEGORY_STATISTICAL,
-            'functionCall' => [Statistical\Averages\Mean::class, 'harmonic'],
-            'argumentCount' => '1+',
-        ],
-        'HEX2BIN' => [
-            'category' => Category::CATEGORY_ENGINEERING,
-            'functionCall' => [Engineering\ConvertHex::class, 'toBinary'],
-            'argumentCount' => '1,2',
-        ],
-        'HEX2DEC' => [
-            'category' => Category::CATEGORY_ENGINEERING,
-            'functionCall' => [Engineering\ConvertHex::class, 'toDecimal'],
-            'argumentCount' => '1',
-        ],
-        'HEX2OCT' => [
-            'category' => Category::CATEGORY_ENGINEERING,
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-            'category' => Category::CATEGORY_MATH_AND_TRIG,
-            'functionCall' => [Statistical\Conditional::class, 'SUMIF'],
-            'argumentCount' => '2,3',
-        ],
-        'SUMIFS' => [
-            'category' => Category::CATEGORY_MATH_AND_TRIG,
-            'functionCall' => [Statistical\Conditional::class, 'SUMIFS'],
-            'argumentCount' => '3+',
-        ],
-        'SUMPRODUCT' => [
-            'category' => Category::CATEGORY_MATH_AND_TRIG,
-            'functionCall' => [MathTrig\Sum::class, 'product'],
-            'argumentCount' => '1+',
-        ],
-        'SUMSQ' => [
-            'category' => Category::CATEGORY_MATH_AND_TRIG,
-            'functionCall' => [MathTrig\SumSquares::class, 'sumSquare'],
-            'argumentCount' => '1+',
-        ],
-        'SUMX2MY2' => [
-            'category' => Category::CATEGORY_MATH_AND_TRIG,
-            'functionCall' => [MathTrig\SumSquares::class, 'sumXSquaredMinusYSquared'],
-            'argumentCount' => '2',
-        ],
-        'SUMX2PY2' => [
-            'category' => Category::CATEGORY_MATH_AND_TRIG,
-            'functionCall' => [MathTrig\SumSquares::class, 'sumXSquaredPlusYSquared'],
-            'argumentCount' => '2',
-        ],
-        'SUMXMY2' => [
-            'category' => Category::CATEGORY_MATH_AND_TRIG,
-            'functionCall' => [MathTrig\SumSquares::class, 'sumXMinusYSquared'],
-            'argumentCount' => '2',
-        ],
-        'SWITCH' => [
-            'category' => Category::CATEGORY_LOGICAL,
-            'functionCall' => [Logical\Conditional::class, 'statementSwitch'],
-            'argumentCount' => '3+',
-        ],
-        'SYD' => [
-            'category' => Category::CATEGORY_FINANCIAL,
-            'functionCall' => [Financial\Depreciation::class, 'SYD'],
-            'argumentCount' => '4',
-        ],
-        'T' => [
-            'category' => Category::CATEGORY_TEXT_AND_DATA,
-            'functionCall' => [TextData\Text::class, 'test'],
-            'argumentCount' => '1',
-        ],
-        'TAKE' => [
-            'category' => Category::CATEGORY_LOOKUP_AND_REFERENCE,
-            'functionCall' => [LookupRef\ChooseRowsEtc::class, 'take'],
-            'argumentCount' => '2-3',
-        ],
-        'TAN' => [
-            'category' => Category::CATEGORY_MATH_AND_TRIG,
-            'functionCall' => [MathTrig\Trig\Tangent::class, 'tan'],
-            'argumentCount' => '1',
-        ],
-        'TANH' => [
-            'category' => Category::CATEGORY_MATH_AND_TRIG,
-            'functionCall' => [MathTrig\Trig\Tangent::class, 'tanh'],
-            'argumentCount' => '1',
-        ],
-        'TBILLEQ' => [
-            'category' => Category::CATEGORY_FINANCIAL,
-            'functionCall' => [Financial\TreasuryBill::class, 'bondEquivalentYield'],
-            'argumentCount' => '3',
-        ],
-        'TBILLPRICE' => [
-            'category' => Category::CATEGORY_FINANCIAL,
-            'functionCall' => [Financial\TreasuryBill::class, 'price'],
-            'argumentCount' => '3',
-        ],
-        'TBILLYIELD' => [
-            'category' => Category::CATEGORY_FINANCIAL,
-            'functionCall' => [Financial\TreasuryBill::class, 'yield'],
-            'argumentCount' => '3',
-        ],
-        'TDIST' => [
-            'category' => Category::CATEGORY_STATISTICAL,
-            'functionCall' => [Statistical\Distributions\StudentT::class, 'distribution'],
-            'argumentCount' => '3',
-        ],
-        'T.DIST' => [
-            'category' => Category::CATEGORY_STATISTICAL,
-            'functionCall' => [Functions::class, 'DUMMY'],
-            'argumentCount' => '3',
-        ],
-        'T.DIST.2T' => [
-            'category' => Category::CATEGORY_STATISTICAL,
-            'functionCall' => [Functions::class, 'DUMMY'],
-            'argumentCount' => '2',
-        ],
-        'T.DIST.RT' => [
-            'category' => Category::CATEGORY_STATISTICAL,
-            'functionCall' => [Functions::class, 'DUMMY'],
-            'argumentCount' => '2',
-        ],
-        'TEXT' => [
-            'category' => Category::CATEGORY_TEXT_AND_DATA,
-            'functionCall' => [TextData\Format::class, 'TEXTFORMAT'],
-            'argumentCount' => '2',
-        ],
-        'TEXTAFTER' => [
-            'category' => Category::CATEGORY_TEXT_AND_DATA,
-            'functionCall' => [TextData\Extract::class, 'after'],
-            'argumentCount' => '2-6',
-        ],
-        'TEXTBEFORE' => [
-            'category' => Category::CATEGORY_TEXT_AND_DATA,
-            'functionCall' => [TextData\Extract::class, 'before'],
-            'argumentCount' => '2-6',
-        ],
-        'TEXTJOIN' => [
-            'category' => Category::CATEGORY_TEXT_AND_DATA,
-            'functionCall' => [TextData\Concatenate::class, 'TEXTJOIN'],
-            'argumentCount' => '3+',
-        ],
-        'TEXTSPLIT' => [
-            'category' => Category::CATEGORY_TEXT_AND_DATA,
-            'functionCall' => [TextData\Text::class, 'split'],
-            'argumentCount' => '2-6',
-        ],
-        'THAIDAYOFWEEK' => [
-            'category' => Category::CATEGORY_DATE_AND_TIME,
-            'functionCall' => [Functions::class, 'DUMMY'],
-            'argumentCount' => '?',
-        ],
-        'THAIDIGIT' => [
-            'category' => Category::CATEGORY_TEXT_AND_DATA,
-            'functionCall' => [Functions::class, 'DUMMY'],
-            'argumentCount' => '?',
-        ],
-        'THAIMONTHOFYEAR' => [
-            'category' => Category::CATEGORY_DATE_AND_TIME,
-            'functionCall' => [Functions::class, 'DUMMY'],
-            'argumentCount' => '?',
-        ],
-        'THAINUMSOUND' => [
-            'category' => Category::CATEGORY_TEXT_AND_DATA,
-            'functionCall' => [Functions::class, 'DUMMY'],
-            'argumentCount' => '?',
-        ],
-        'THAINUMSTRING' => [
-            'category' => Category::CATEGORY_TEXT_AND_DATA,
-            'functionCall' => [Functions::class, 'DUMMY'],
-            'argumentCount' => '?',
-        ],
-        'THAISTRINGLENGTH' => [
-            'category' => Category::CATEGORY_TEXT_AND_DATA,
-            'functionCall' => [Functions::class, 'DUMMY'],
-            'argumentCount' => '?',
-        ],
-        'THAIYEAR' => [
-            'category' => Category::CATEGORY_DATE_AND_TIME,
-            'functionCall' => [Functions::class, 'DUMMY'],
-            'argumentCount' => '?',
-        ],
-        'TIME' => [
-            'category' => Category::CATEGORY_DATE_AND_TIME,
-            'functionCall' => [DateTimeExcel\Time::class, 'fromHMS'],
-            'argumentCount' => '3',
-        ],
-        'TIMEVALUE' => [
-            'category' => Category::CATEGORY_DATE_AND_TIME,
-            'functionCall' => [DateTimeExcel\TimeValue::class, 'fromString'],
-            'argumentCount' => '1',
-        ],
-        'TINV' => [
-            'category' => Category::CATEGORY_STATISTICAL,
-            'functionCall' => [Statistical\Distributions\StudentT::class, 'inverse'],
-            'argumentCount' => '2',
-        ],
-        'T.INV' => [
-            'category' => Category::CATEGORY_STATISTICAL,
-            'functionCall' => [Statistical\Distributions\StudentT::class, 'inverse'],
-            'argumentCount' => '2',
-        ],
-        'T.INV.2T' => [
-            'category' => Category::CATEGORY_STATISTICAL,
-            'functionCall' => [Functions::class, 'DUMMY'],
-            'argumentCount' => '2',
-        ],
-        'TODAY' => [
-            'category' => Category::CATEGORY_DATE_AND_TIME,
-            'functionCall' => [DateTimeExcel\Current::class, 'today'],
-            'argumentCount' => '0',
-        ],
-        'TOCOL' => [
-            'category' => Category::CATEGORY_MATH_AND_TRIG,
-            'functionCall' => [Functions::class, 'DUMMY'],
-            'argumentCount' => '1-3',
-        ],
-        'TOROW' => [
-            'category' => Category::CATEGORY_MATH_AND_TRIG,
-            'functionCall' => [Functions::class, 'DUMMY'],
-            'argumentCount' => '1-3',
-        ],
-        'TRANSPOSE' => [
-            'category' => Category::CATEGORY_LOOKUP_AND_REFERENCE,
-            'functionCall' => [LookupRef\Matrix::class, 'transpose'],
-            'argumentCount' => '1',
-        ],
-        'TREND' => [
-            'category' => Category::CATEGORY_STATISTICAL,
-            'functionCall' => [Statistical\Trends::class, 'TREND'],
-            'argumentCount' => '1-4',
-        ],
-        'TRIM' => [
-            'category' => Category::CATEGORY_TEXT_AND_DATA,
-            'functionCall' => [TextData\Trim::class, 'spaces'],
-            'argumentCount' => '1',
-        ],
-        'TRIMMEAN' => [
-            'category' => Category::CATEGORY_STATISTICAL,
-            'functionCall' => [Statistical\Averages\Mean::class, 'trim'],
-            'argumentCount' => '2',
-        ],
-        'TRUE' => [
-            'category' => Category::CATEGORY_LOGICAL,
-            'functionCall' => [Logical\Boolean::class, 'TRUE'],
-            'argumentCount' => '0',
-        ],
-        'TRUNC' => [
-            'category' => Category::CATEGORY_MATH_AND_TRIG,
-            'functionCall' => [MathTrig\Trunc::class, 'evaluate'],
-            'argumentCount' => '1,2',
-        ],
-        'TTEST' => [
-            'category' => Category::CATEGORY_STATISTICAL,
-            'functionCall' => [Functions::class, 'DUMMY'],
-            'argumentCount' => '4',
-        ],
-        'T.TEST' => [
-            'category' => Category::CATEGORY_STATISTICAL,
-            'functionCall' => [Functions::class, 'DUMMY'],
-            'argumentCount' => '4',
-        ],
-        'TYPE' => [
-            'category' => Category::CATEGORY_INFORMATION,
-            'functionCall' => [Information\Value::class, 'type'],
-            'argumentCount' => '1',
-        ],
-        'UNICHAR' => [
-            'category' => Category::CATEGORY_TEXT_AND_DATA,
-            'functionCall' => [TextData\CharacterConvert::class, 'character'],
-            'argumentCount' => '1',
-        ],
-        'UNICODE' => [
-            'category' => Category::CATEGORY_TEXT_AND_DATA,
-            'functionCall' => [TextData\CharacterConvert::class, 'code'],
-            'argumentCount' => '1',
-        ],
-        'UNIQUE' => [
-            'category' => Category::CATEGORY_LOOKUP_AND_REFERENCE,
-            'functionCall' => [LookupRef\Unique::class, 'unique'],
-            'argumentCount' => '1+',
-        ],
-        'UPPER' => [
-            'category' => Category::CATEGORY_TEXT_AND_DATA,
-            'functionCall' => [TextData\CaseConvert::class, 'upper'],
-            'argumentCount' => '1',
-        ],
-        'USDOLLAR' => [
-            'category' => Category::CATEGORY_FINANCIAL,
-            'functionCall' => [Financial\Dollar::class, 'format'],
-            'argumentCount' => '2',
-        ],
-        'VALUE' => [
-            'category' => Category::CATEGORY_TEXT_AND_DATA,
-            'functionCall' => [TextData\Format::class, 'VALUE'],
-            'argumentCount' => '1',
-        ],
-        'VALUETOTEXT' => [
-            'category' => Category::CATEGORY_TEXT_AND_DATA,
-            'functionCall' => [TextData\Format::class, 'valueToText'],
-            'argumentCount' => '1,2',
-        ],
-        'VAR' => [
-            'category' => Category::CATEGORY_STATISTICAL,
-            'functionCall' => [Statistical\Variances::class, 'VAR'],
-            'argumentCount' => '1+',
-        ],
-        'VAR.P' => [
-            'category' => Category::CATEGORY_STATISTICAL,
-            'functionCall' => [Statistical\Variances::class, 'VARP'],
-            'argumentCount' => '1+',
-        ],
-        'VAR.S' => [
-            'category' => Category::CATEGORY_STATISTICAL,
-            'functionCall' => [Statistical\Variances::class, 'VAR'],
-            'argumentCount' => '1+',
-        ],
-        'VARA' => [
-            'category' => Category::CATEGORY_STATISTICAL,
-            'functionCall' => [Statistical\Variances::class, 'VARA'],
-            'argumentCount' => '1+',
-        ],
-        'VARP' => [
-            'category' => Category::CATEGORY_STATISTICAL,
-            'functionCall' => [Statistical\Variances::class, 'VARP'],
-            'argumentCount' => '1+',
-        ],
-        'VARPA' => [
-            'category' => Category::CATEGORY_STATISTICAL,
-            'functionCall' => [Statistical\Variances::class, 'VARPA'],
-            'argumentCount' => '1+',
-        ],
-        'VDB' => [
-            'category' => Category::CATEGORY_FINANCIAL,
-            'functionCall' => [Functions::class, 'DUMMY'],
-            'argumentCount' => '5-7',
-        ],
-        'VLOOKUP' => [
-            'category' => Category::CATEGORY_LOOKUP_AND_REFERENCE,
-            'functionCall' => [LookupRef\VLookup::class, 'lookup'],
-            'argumentCount' => '3,4',
-        ],
-        'VSTACK' => [
-            'category' => Category::CATEGORY_MATH_AND_TRIG,
-            'functionCall' => [Functions::class, 'DUMMY'],
-            'argumentCount' => '1+',
-        ],
-        'WEBSERVICE' => [
-            'category' => Category::CATEGORY_WEB,
-            'functionCall' => [Web\Service::class, 'webService'],
-            'argumentCount' => '1',
-        ],
-        'WEEKDAY' => [
-            'category' => Category::CATEGORY_DATE_AND_TIME,
-            'functionCall' => [DateTimeExcel\Week::class, 'day'],
-            'argumentCount' => '1,2',
-        ],
-        'WEEKNUM' => [
-            'category' => Category::CATEGORY_DATE_AND_TIME,
-            'functionCall' => [DateTimeExcel\Week::class, 'number'],
-            'argumentCount' => '1,2',
-        ],
-        'WEIBULL' => [
-            'category' => Category::CATEGORY_STATISTICAL,
-            'functionCall' => [Statistical\Distributions\Weibull::class, 'distribution'],
-            'argumentCount' => '4',
-        ],
-        'WEIBULL.DIST' => [
-            'category' => Category::CATEGORY_STATISTICAL,
-            'functionCall' => [Statistical\Distributions\Weibull::class, 'distribution'],
-            'argumentCount' => '4',
-        ],
-        'WORKDAY' => [
-            'category' => Category::CATEGORY_DATE_AND_TIME,
-            'functionCall' => [DateTimeExcel\WorkDay::class, 'date'],
-            'argumentCount' => '2-3',
-        ],
-        'WORKDAY.INTL' => [
-            'category' => Category::CATEGORY_DATE_AND_TIME,
-            'functionCall' => [Functions::class, 'DUMMY'],
-            'argumentCount' => '2-4',
-        ],
-        'WRAPCOLS' => [
-            'category' => Category::CATEGORY_MATH_AND_TRIG,
-            'functionCall' => [Functions::class, 'DUMMY'],
-            'argumentCount' => '2-3',
-        ],
-        'WRAPROWS' => [
-            'category' => Category::CATEGORY_MATH_AND_TRIG,
-            'functionCall' => [Functions::class, 'DUMMY'],
-            'argumentCount' => '2-3',
-        ],
-        'XIRR' => [
-            'category' => Category::CATEGORY_FINANCIAL,
-            'functionCall' => [Financial\CashFlow\Variable\NonPeriodic::class, 'rate'],
-            'argumentCount' => '2,3',
-        ],
-        'XLOOKUP' => [
-            'category' => Category::CATEGORY_LOOKUP_AND_REFERENCE,
-            'functionCall' => [Functions::class, 'DUMMY'],
-            'argumentCount' => '3-6',
-        ],
-        'XNPV' => [
-            'category' => Category::CATEGORY_FINANCIAL,
-            'functionCall' => [Financial\CashFlow\Variable\NonPeriodic::class, 'presentValue'],
-            'argumentCount' => '3',
-        ],
-        'XMATCH' => [
-            'category' => Category::CATEGORY_LOOKUP_AND_REFERENCE,
-            'functionCall' => [Functions::class, 'DUMMY'],
-            'argumentCount' => '2,3',
-        ],
-        'XOR' => [
-            'category' => Category::CATEGORY_LOGICAL,
-            'functionCall' => [Logical\Operations::class, 'logicalXor'],
-            'argumentCount' => '1+',
-        ],
-        'YEAR' => [
-            'category' => Category::CATEGORY_DATE_AND_TIME,
-            'functionCall' => [DateTimeExcel\DateParts::class, 'year'],
-            'argumentCount' => '1',
-        ],
-        'YEARFRAC' => [
-            'category' => Category::CATEGORY_DATE_AND_TIME,
-            'functionCall' => [DateTimeExcel\YearFrac::class, 'fraction'],
-            'argumentCount' => '2,3',
-        ],
-        'YIELD' => [
-            'category' => Category::CATEGORY_FINANCIAL,
-            'functionCall' => [Functions::class, 'DUMMY'],
-            'argumentCount' => '6,7',
-        ],
-        'YIELDDISC' => [
-            'category' => Category::CATEGORY_FINANCIAL,
-            'functionCall' => [Financial\Securities\Yields::class, 'yieldDiscounted'],
-            'argumentCount' => '4,5',
-        ],
-        'YIELDMAT' => [
-            'category' => Category::CATEGORY_FINANCIAL,
-            'functionCall' => [Financial\Securities\Yields::class, 'yieldAtMaturity'],
-            'argumentCount' => '5,6',
-        ],
-        'ZTEST' => [
-            'category' => Category::CATEGORY_STATISTICAL,
-            'functionCall' => [Statistical\Distributions\StandardNormal::class, 'zTest'],
-            'argumentCount' => '2-3',
-        ],
-        'Z.TEST' => [
-            'category' => Category::CATEGORY_STATISTICAL,
-            'functionCall' => [Statistical\Distributions\StandardNormal::class, 'zTest'],
-            'argumentCount' => '2-3',
-        ],
-    ];
-
     /**
      *    Internal functions used for special control purposes.
      */
@@ -3223,11 +571,12 @@ public function setLocale(string $locale): bool
 
                 //    Retrieve the list of locale or language specific function names
                 $localeFunctions = file($functionNamesFile, FILE_IGNORE_NEW_LINES | FILE_SKIP_EMPTY_LINES) ?: [];
+                $phpSpreadsheetFunctions = &self::getFunctionsAddress();
                 foreach ($localeFunctions as $localeFunction) {
                     [$localeFunction] = explode('##', $localeFunction); //    Strip out comments
                     if (str_contains($localeFunction, '=')) {
                         [$fName, $lfName] = array_map('trim', explode('=', $localeFunction));
-                        if ((str_starts_with($fName, '*') || isset(self::$phpSpreadsheetFunctions[$fName])) && ($lfName != '') && ($fName != $lfName)) {
+                        if ((str_starts_with($fName, '*') || isset($phpSpreadsheetFunctions[$fName])) && ($lfName != '') && ($fName != $lfName)) {
                             self::$localeFunctions[$fName] = $lfName;
                         }
                     }
@@ -4087,6 +1436,7 @@ private function internalParseFormula(string $formula, ?Cell $cell = null): bool
         if (($formula = $this->convertMatrixReferences(trim($formula))) === false) {
             return false;
         }
+        $phpSpreadsheetFunctions = &self::getFunctionsAddress();
 
         //    If we're using cell caching, then $pCell may well be flushed back to the cache (which detaches the parent worksheet),
         //        so we store the parent worksheet so that we can re-attach it when necessary
@@ -4185,8 +1535,8 @@ private function internalParseFormula(string $formula, ?Cell $cell = null): bool
                     $output[] = $stack->pop(); //    Pop the function and push onto the output
                     if (isset(self::$controlFunctions[$functionName])) {
                         $expectedArgumentCount = self::$controlFunctions[$functionName]['argumentCount'];
-                    } elseif (isset(self::$phpSpreadsheetFunctions[$functionName])) {
-                        $expectedArgumentCount = self::$phpSpreadsheetFunctions[$functionName]['argumentCount'];
+                    } elseif (isset($phpSpreadsheetFunctions[$functionName])) {
+                        $expectedArgumentCount = $phpSpreadsheetFunctions[$functionName]['argumentCount'];
                     } else {    // did we somehow push a non-function on the stack? this should never happen
                         return $this->raiseFormulaError('Formula Error: Internal error, non-function on stack');
                     }
@@ -4287,7 +1637,7 @@ private function internalParseFormula(string $formula, ?Cell $cell = null): bool
 
                 if (preg_match('/^' . self::CALCULATION_REGEXP_FUNCTION . '$/miu', $val, $matches)) {
                     $val = (string) preg_replace('/\s/u', '', $val);
-                    if (isset(self::$phpSpreadsheetFunctions[strtoupper($matches[1])]) || isset(self::$controlFunctions[strtoupper($matches[1])])) {    // it's a function
+                    if (isset($phpSpreadsheetFunctions[strtoupper($matches[1])]) || isset(self::$controlFunctions[strtoupper($matches[1])])) {    // it's a function
                         $valToUpper = strtoupper($val);
                     } else {
                         $valToUpper = 'NAME.ERROR(';
@@ -4608,6 +1958,7 @@ private function processTokenStack(mixed $tokens, ?string $cellID = null, ?Cell
         if ($tokens === false) {
             return false;
         }
+        $phpSpreadsheetFunctions = &self::getFunctionsAddress();
 
         //    If we're using cell caching, then $pCell may well be flushed back to the cache (which detaches the parent cell collection),
         //        so we store the parent cell collection so that we can re-attach it when necessary
@@ -5065,14 +2416,14 @@ private function processTokenStack(mixed $tokens, ?string $cellID = null, ?Cell
                 if ($functionName !== 'MKMATRIX') {
                     $this->debugLog->writeDebugLog('Evaluating Function %s() with %s argument%s', self::localeFunc($functionName), (($argCount == 0) ? 'no' : $argCount), (($argCount == 1) ? '' : 's'));
                 }
-                if ((isset(self::$phpSpreadsheetFunctions[$functionName])) || (isset(self::$controlFunctions[$functionName]))) {    // function
+                if ((isset($phpSpreadsheetFunctions[$functionName])) || (isset(self::$controlFunctions[$functionName]))) {    // function
                     $passByReference = false;
                     $passCellReference = false;
                     $functionCall = null;
-                    if (isset(self::$phpSpreadsheetFunctions[$functionName])) {
-                        $functionCall = self::$phpSpreadsheetFunctions[$functionName]['functionCall'];
-                        $passByReference = isset(self::$phpSpreadsheetFunctions[$functionName]['passByReference']);
-                        $passCellReference = isset(self::$phpSpreadsheetFunctions[$functionName]['passCellReference']);
+                    if (isset($phpSpreadsheetFunctions[$functionName])) {
+                        $functionCall = $phpSpreadsheetFunctions[$functionName]['functionCall'];
+                        $passByReference = isset($phpSpreadsheetFunctions[$functionName]['passByReference']);
+                        $passCellReference = isset($phpSpreadsheetFunctions[$functionName]['passCellReference']);
                     } elseif (isset(self::$controlFunctions[$functionName])) {
                         $functionCall = self::$controlFunctions[$functionName]['functionCall'];
                         $passByReference = isset(self::$controlFunctions[$functionName]['passByReference']);
@@ -5087,8 +2438,8 @@ private function processTokenStack(mixed $tokens, ?string $cellID = null, ?Cell
                         $a = $argCount - $i - 1;
                         if (
                             ($passByReference)
-                            && (isset(self::$phpSpreadsheetFunctions[$functionName]['passByReference'][$a]))
-                            && (self::$phpSpreadsheetFunctions[$functionName]['passByReference'][$a])
+                            && (isset($phpSpreadsheetFunctions[$functionName]['passByReference'][$a]))
+                            && ($phpSpreadsheetFunctions[$functionName]['passByReference'][$a])
                         ) {
                             /** @var array $arg */
                             if ($arg['reference'] === null) {
@@ -5620,26 +2971,20 @@ public function extractNamedRange(string &$range = 'A1', ?Worksheet $worksheet =
     public function isImplemented(string $function): bool
     {
         $function = strtoupper($function);
-        $notImplemented = !isset(self::$phpSpreadsheetFunctions[$function]) || (is_array(self::$phpSpreadsheetFunctions[$function]['functionCall']) && self::$phpSpreadsheetFunctions[$function]['functionCall'][1] === 'DUMMY');
+        $phpSpreadsheetFunctions = &self::getFunctionsAddress();
+        $notImplemented = !isset($phpSpreadsheetFunctions[$function]) || (is_array($phpSpreadsheetFunctions[$function]['functionCall']) && $phpSpreadsheetFunctions[$function]['functionCall'][1] === 'DUMMY');
 
         return !$notImplemented;
     }
 
-    /**
-     * Get a list of all implemented functions as an array of function objects.
-     */
-    public static function getFunctions(): array
-    {
-        return self::$phpSpreadsheetFunctions;
-    }
-
     /**
      * Get a list of implemented Excel function names.
      */
     public function getImplementedFunctionNames(): array
     {
         $returnValue = [];
-        foreach (self::$phpSpreadsheetFunctions as $functionName => $function) {
+        $phpSpreadsheetFunctions = &self::getFunctionsAddress();
+        foreach ($phpSpreadsheetFunctions as $functionName => $function) {
             if ($this->isImplemented($functionName)) {
                 $returnValue[] = $functionName;
             }
diff --git a/src/PhpSpreadsheet/Calculation/CalculationBase.php b/src/PhpSpreadsheet/Calculation/CalculationBase.php
new file mode 100644
index 0000000000..1095cf6d91
--- /dev/null
+++ b/src/PhpSpreadsheet/Calculation/CalculationBase.php
@@ -0,0 +1,55 @@
+<?php
+
+namespace PhpOffice\PhpSpreadsheet\Calculation;
+
+class CalculationBase
+{
+    /**
+     * Get a list of all implemented functions as an array of function objects.
+     *
+     * return array<string, array<string, mixed>>
+     */
+    public static function getFunctions(): array
+    {
+        return FunctionArray::$phpSpreadsheetFunctions;
+    }
+
+    /**
+     * Get address of list of all implemented functions as an array of function objects.
+     *
+     * @return array<string, array<string, mixed>>
+     */
+    protected static function &getFunctionsAddress(): array
+    {
+        return FunctionArray::$phpSpreadsheetFunctions;
+    }
+
+    /**
+     * @param array<string, array<string, mixed>> $value
+     */
+    public static function addFunction(string $key, array $value): bool
+    {
+        $key = strtoupper($key);
+        if (array_key_exists($key, FunctionArray::$phpSpreadsheetFunctions)) {
+            return false;
+        }
+        $value['custom'] = true;
+        FunctionArray::$phpSpreadsheetFunctions[$key] = $value;
+
+        return true;
+    }
+
+    public static function removeFunction(string $key): bool
+    {
+        $key = strtoupper($key);
+        if (array_key_exists($key, FunctionArray::$phpSpreadsheetFunctions)) {
+            if (FunctionArray::$phpSpreadsheetFunctions[$key]['custom'] ?? false) {
+                unset(FunctionArray::$phpSpreadsheetFunctions[$key]);
+
+                return true;
+            }
+        }
+
+        return false;
+    }
+}
diff --git a/src/PhpSpreadsheet/Calculation/FunctionArray.php b/src/PhpSpreadsheet/Calculation/FunctionArray.php
new file mode 100644
index 0000000000..83931587e9
--- /dev/null
+++ b/src/PhpSpreadsheet/Calculation/FunctionArray.php
@@ -0,0 +1,2658 @@
+<?php
+
+namespace PhpOffice\PhpSpreadsheet\Calculation;
+
+class FunctionArray extends CalculationBase
+{
+    /**
+     * Array of functions usable on Spreadsheet.
+     *
+     * @var array<string, array<string, mixed>>
+     */
+    protected static array $phpSpreadsheetFunctions = [
+        'ABS' => [
+            'category' => Category::CATEGORY_MATH_AND_TRIG,
+            'functionCall' => [MathTrig\Absolute::class, 'evaluate'],
+            'argumentCount' => '1',
+        ],
+        'ACCRINT' => [
+            'category' => Category::CATEGORY_FINANCIAL,
+            'functionCall' => [Financial\Securities\AccruedInterest::class, 'periodic'],
+            'argumentCount' => '4-8',
+        ],
+        'ACCRINTM' => [
+            'category' => Category::CATEGORY_FINANCIAL,
+            'functionCall' => [Financial\Securities\AccruedInterest::class, 'atMaturity'],
+            'argumentCount' => '3-5',
+        ],
+        'ACOS' => [
+            'category' => Category::CATEGORY_MATH_AND_TRIG,
+            'functionCall' => [MathTrig\Trig\Cosine::class, 'acos'],
+            'argumentCount' => '1',
+        ],
+        'ACOSH' => [
+            'category' => Category::CATEGORY_MATH_AND_TRIG,
+            'functionCall' => [MathTrig\Trig\Cosine::class, 'acosh'],
+            'argumentCount' => '1',
+        ],
+        'ACOT' => [
+            'category' => Category::CATEGORY_MATH_AND_TRIG,
+            'functionCall' => [MathTrig\Trig\Cotangent::class, 'acot'],
+            'argumentCount' => '1',
+        ],
+        'ACOTH' => [
+            'category' => Category::CATEGORY_MATH_AND_TRIG,
+            'functionCall' => [MathTrig\Trig\Cotangent::class, 'acoth'],
+            'argumentCount' => '1',
+        ],
+        'ADDRESS' => [
+            'category' => Category::CATEGORY_LOOKUP_AND_REFERENCE,
+            'functionCall' => [LookupRef\Address::class, 'cell'],
+            'argumentCount' => '2-5',
+        ],
+        'AGGREGATE' => [
+            'category' => Category::CATEGORY_MATH_AND_TRIG,
+            'functionCall' => [Functions::class, 'DUMMY'],
+            'argumentCount' => '3+',
+        ],
+        'AMORDEGRC' => [
+            'category' => Category::CATEGORY_FINANCIAL,
+            'functionCall' => [Financial\Amortization::class, 'AMORDEGRC'],
+            'argumentCount' => '6,7',
+        ],
+        'AMORLINC' => [
+            'category' => Category::CATEGORY_FINANCIAL,
+            'functionCall' => [Financial\Amortization::class, 'AMORLINC'],
+            'argumentCount' => '6,7',
+        ],
+        'ANCHORARRAY' => [
+            'category' => Category::CATEGORY_MICROSOFT_INTERNAL,
+            'functionCall' => [Internal\ExcelArrayPseudoFunctions::class, 'anchorArray'],
+            'argumentCount' => '1',
+            'passCellReference' => true,
+            'passByReference' => [true],
+        ],
+        'AND' => [
+            'category' => Category::CATEGORY_LOGICAL,
+            'functionCall' => [Logical\Operations::class, 'logicalAnd'],
+            'argumentCount' => '1+',
+        ],
+        'ARABIC' => [
+            'category' => Category::CATEGORY_MATH_AND_TRIG,
+            'functionCall' => [MathTrig\Arabic::class, 'evaluate'],
+            'argumentCount' => '1',
+        ],
+        'AREAS' => [
+            'category' => Category::CATEGORY_LOOKUP_AND_REFERENCE,
+            'functionCall' => [Functions::class, 'DUMMY'],
+            'argumentCount' => '1',
+        ],
+        'ARRAYTOTEXT' => [
+            'category' => Category::CATEGORY_TEXT_AND_DATA,
+            'functionCall' => [TextData\Text::class, 'fromArray'],
+            'argumentCount' => '1,2',
+        ],
+        'ASC' => [
+            'category' => Category::CATEGORY_TEXT_AND_DATA,
+            'functionCall' => [Functions::class, 'DUMMY'],
+            'argumentCount' => '1',
+        ],
+        'ASIN' => [
+            'category' => Category::CATEGORY_MATH_AND_TRIG,
+            'functionCall' => [MathTrig\Trig\Sine::class, 'asin'],
+            'argumentCount' => '1',
+        ],
+        'ASINH' => [
+            'category' => Category::CATEGORY_MATH_AND_TRIG,
+            'functionCall' => [MathTrig\Trig\Sine::class, 'asinh'],
+            'argumentCount' => '1',
+        ],
+        'ATAN' => [
+            'category' => Category::CATEGORY_MATH_AND_TRIG,
+            'functionCall' => [MathTrig\Trig\Tangent::class, 'atan'],
+            'argumentCount' => '1',
+        ],
+        'ATAN2' => [
+            'category' => Category::CATEGORY_MATH_AND_TRIG,
+            'functionCall' => [MathTrig\Trig\Tangent::class, 'atan2'],
+            'argumentCount' => '2',
+        ],
+        'ATANH' => [
+            'category' => Category::CATEGORY_MATH_AND_TRIG,
+            'functionCall' => [MathTrig\Trig\Tangent::class, 'atanh'],
+            'argumentCount' => '1',
+        ],
+        'AVEDEV' => [
+            'category' => Category::CATEGORY_STATISTICAL,
+            'functionCall' => [Statistical\Averages::class, 'averageDeviations'],
+            'argumentCount' => '1+',
+        ],
+        'AVERAGE' => [
+            'category' => Category::CATEGORY_STATISTICAL,
+            'functionCall' => [Statistical\Averages::class, 'average'],
+            'argumentCount' => '1+',
+        ],
+        'AVERAGEA' => [
+            'category' => Category::CATEGORY_STATISTICAL,
+            'functionCall' => [Statistical\Averages::class, 'averageA'],
+            'argumentCount' => '1+',
+        ],
+        'AVERAGEIF' => [
+            'category' => Category::CATEGORY_STATISTICAL,
+            'functionCall' => [Statistical\Conditional::class, 'AVERAGEIF'],
+            'argumentCount' => '2,3',
+        ],
+        'AVERAGEIFS' => [
+            'category' => Category::CATEGORY_STATISTICAL,
+            'functionCall' => [Statistical\Conditional::class, 'AVERAGEIFS'],
+            'argumentCount' => '3+',
+        ],
+        'BAHTTEXT' => [
+            'category' => Category::CATEGORY_TEXT_AND_DATA,
+            'functionCall' => [Functions::class, 'DUMMY'],
+            'argumentCount' => '1',
+        ],
+        'BASE' => [
+            'category' => Category::CATEGORY_MATH_AND_TRIG,
+            'functionCall' => [MathTrig\Base::class, 'evaluate'],
+            'argumentCount' => '2,3',
+        ],
+        'BESSELI' => [
+            'category' => Category::CATEGORY_ENGINEERING,
+            'functionCall' => [Engineering\BesselI::class, 'BESSELI'],
+            'argumentCount' => '2',
+        ],
+        'BESSELJ' => [
+            'category' => Category::CATEGORY_ENGINEERING,
+            'functionCall' => [Engineering\BesselJ::class, 'BESSELJ'],
+            'argumentCount' => '2',
+        ],
+        'BESSELK' => [
+            'category' => Category::CATEGORY_ENGINEERING,
+            'functionCall' => [Engineering\BesselK::class, 'BESSELK'],
+            'argumentCount' => '2',
+        ],
+        'BESSELY' => [
+            'category' => Category::CATEGORY_ENGINEERING,
+            'functionCall' => [Engineering\BesselY::class, 'BESSELY'],
+            'argumentCount' => '2',
+        ],
+        'BETADIST' => [
+            'category' => Category::CATEGORY_STATISTICAL,
+            'functionCall' => [Statistical\Distributions\Beta::class, 'distribution'],
+            'argumentCount' => '3-5',
+        ],
+        'BETA.DIST' => [
+            'category' => Category::CATEGORY_STATISTICAL,
+            'functionCall' => [Functions::class, 'DUMMY'],
+            'argumentCount' => '4-6',
+        ],
+        'BETAINV' => [
+            'category' => Category::CATEGORY_STATISTICAL,
+            'functionCall' => [Statistical\Distributions\Beta::class, 'inverse'],
+            'argumentCount' => '3-5',
+        ],
+        'BETA.INV' => [
+            'category' => Category::CATEGORY_STATISTICAL,
+            'functionCall' => [Statistical\Distributions\Beta::class, 'inverse'],
+            'argumentCount' => '3-5',
+        ],
+        'BIN2DEC' => [
+            'category' => Category::CATEGORY_ENGINEERING,
+            'functionCall' => [Engineering\ConvertBinary::class, 'toDecimal'],
+            'argumentCount' => '1',
+        ],
+        'BIN2HEX' => [
+            'category' => Category::CATEGORY_ENGINEERING,
+            'functionCall' => [Engineering\ConvertBinary::class, 'toHex'],
+            'argumentCount' => '1,2',
+        ],
+        'BIN2OCT' => [
+            'category' => Category::CATEGORY_ENGINEERING,
+            'functionCall' => [Engineering\ConvertBinary::class, 'toOctal'],
+            'argumentCount' => '1,2',
+        ],
+        'BINOMDIST' => [
+            'category' => Category::CATEGORY_STATISTICAL,
+            'functionCall' => [Statistical\Distributions\Binomial::class, 'distribution'],
+            'argumentCount' => '4',
+        ],
+        'BINOM.DIST' => [
+            'category' => Category::CATEGORY_STATISTICAL,
+            'functionCall' => [Statistical\Distributions\Binomial::class, 'distribution'],
+            'argumentCount' => '4',
+        ],
+        'BINOM.DIST.RANGE' => [
+            'category' => Category::CATEGORY_STATISTICAL,
+            'functionCall' => [Statistical\Distributions\Binomial::class, 'range'],
+            'argumentCount' => '3,4',
+        ],
+        'BINOM.INV' => [
+            'category' => Category::CATEGORY_STATISTICAL,
+            'functionCall' => [Statistical\Distributions\Binomial::class, 'inverse'],
+            'argumentCount' => '3',
+        ],
+        'BITAND' => [
+            'category' => Category::CATEGORY_ENGINEERING,
+            'functionCall' => [Engineering\BitWise::class, 'BITAND'],
+            'argumentCount' => '2',
+        ],
+        'BITOR' => [
+            'category' => Category::CATEGORY_ENGINEERING,
+            'functionCall' => [Engineering\BitWise::class, 'BITOR'],
+            'argumentCount' => '2',
+        ],
+        'BITXOR' => [
+            'category' => Category::CATEGORY_ENGINEERING,
+            'functionCall' => [Engineering\BitWise::class, 'BITXOR'],
+            'argumentCount' => '2',
+        ],
+        'BITLSHIFT' => [
+            'category' => Category::CATEGORY_ENGINEERING,
+            'functionCall' => [Engineering\BitWise::class, 'BITLSHIFT'],
+            'argumentCount' => '2',
+        ],
+        'BITRSHIFT' => [
+            'category' => Category::CATEGORY_ENGINEERING,
+            'functionCall' => [Engineering\BitWise::class, 'BITRSHIFT'],
+            'argumentCount' => '2',
+        ],
+        'BYCOL' => [
+            'category' => Category::CATEGORY_LOGICAL,
+            'functionCall' => [Functions::class, 'DUMMY'],
+            'argumentCount' => '*',
+        ],
+        'BYROW' => [
+            'category' => Category::CATEGORY_LOGICAL,
+            'functionCall' => [Functions::class, 'DUMMY'],
+            'argumentCount' => '*',
+        ],
+        'CEILING' => [
+            'category' => Category::CATEGORY_MATH_AND_TRIG,
+            'functionCall' => [MathTrig\Ceiling::class, 'ceiling'],
+            'argumentCount' => '1-2', // 2 for Excel, 1-2 for Ods/Gnumeric
+        ],
+        'CEILING.MATH' => [
+            'category' => Category::CATEGORY_MATH_AND_TRIG,
+            'functionCall' => [MathTrig\Ceiling::class, 'math'],
+            'argumentCount' => '1-3',
+        ],
+        'CEILING.PRECISE' => [
+            'category' => Category::CATEGORY_MATH_AND_TRIG,
+            'functionCall' => [MathTrig\Ceiling::class, 'precise'],
+            'argumentCount' => '1,2',
+        ],
+        'CELL' => [
+            'category' => Category::CATEGORY_INFORMATION,
+            'functionCall' => [Functions::class, 'DUMMY'],
+            'argumentCount' => '1,2',
+        ],
+        'CHAR' => [
+            'category' => Category::CATEGORY_TEXT_AND_DATA,
+            'functionCall' => [TextData\CharacterConvert::class, 'character'],
+            'argumentCount' => '1',
+        ],
+        'CHIDIST' => [
+            'category' => Category::CATEGORY_STATISTICAL,
+            'functionCall' => [Statistical\Distributions\ChiSquared::class, 'distributionRightTail'],
+            'argumentCount' => '2',
+        ],
+        'CHISQ.DIST' => [
+            'category' => Category::CATEGORY_STATISTICAL,
+            'functionCall' => [Statistical\Distributions\ChiSquared::class, 'distributionLeftTail'],
+            'argumentCount' => '3',
+        ],
+        'CHISQ.DIST.RT' => [
+            'category' => Category::CATEGORY_STATISTICAL,
+            'functionCall' => [Statistical\Distributions\ChiSquared::class, 'distributionRightTail'],
+            'argumentCount' => '2',
+        ],
+        'CHIINV' => [
+            'category' => Category::CATEGORY_STATISTICAL,
+            'functionCall' => [Statistical\Distributions\ChiSquared::class, 'inverseRightTail'],
+            'argumentCount' => '2',
+        ],
+        'CHISQ.INV' => [
+            'category' => Category::CATEGORY_STATISTICAL,
+            'functionCall' => [Statistical\Distributions\ChiSquared::class, 'inverseLeftTail'],
+            'argumentCount' => '2',
+        ],
+        'CHISQ.INV.RT' => [
+            'category' => Category::CATEGORY_STATISTICAL,
+            'functionCall' => [Statistical\Distributions\ChiSquared::class, 'inverseRightTail'],
+            'argumentCount' => '2',
+        ],
+        'CHITEST' => [
+            'category' => Category::CATEGORY_STATISTICAL,
+            'functionCall' => [Statistical\Distributions\ChiSquared::class, 'test'],
+            'argumentCount' => '2',
+        ],
+        'CHISQ.TEST' => [
+            'category' => Category::CATEGORY_STATISTICAL,
+            'functionCall' => [Statistical\Distributions\ChiSquared::class, 'test'],
+            'argumentCount' => '2',
+        ],
+        'CHOOSE' => [
+            'category' => Category::CATEGORY_LOOKUP_AND_REFERENCE,
+            'functionCall' => [LookupRef\Selection::class, 'CHOOSE'],
+            'argumentCount' => '2+',
+        ],
+        'CHOOSECOLS' => [
+            'category' => Category::CATEGORY_LOOKUP_AND_REFERENCE,
+            'functionCall' => [LookupRef\ChooseRowsEtc::class, 'chooseCols'],
+            'argumentCount' => '2+',
+        ],
+        'CHOOSEROWS' => [
+            'category' => Category::CATEGORY_LOOKUP_AND_REFERENCE,
+            'functionCall' => [LookupRef\ChooseRowsEtc::class, 'chooseRows'],
+            'argumentCount' => '2+',
+        ],
+        'CLEAN' => [
+            'category' => Category::CATEGORY_TEXT_AND_DATA,
+            'functionCall' => [TextData\Trim::class, 'nonPrintable'],
+            'argumentCount' => '1',
+        ],
+        'CODE' => [
+            'category' => Category::CATEGORY_TEXT_AND_DATA,
+            'functionCall' => [TextData\CharacterConvert::class, 'code'],
+            'argumentCount' => '1',
+        ],
+        'COLUMN' => [
+            'category' => Category::CATEGORY_LOOKUP_AND_REFERENCE,
+            'functionCall' => [LookupRef\RowColumnInformation::class, 'COLUMN'],
+            'argumentCount' => '-1',
+            'passCellReference' => true,
+            'passByReference' => [true],
+        ],
+        'COLUMNS' => [
+            'category' => Category::CATEGORY_LOOKUP_AND_REFERENCE,
+            'functionCall' => [LookupRef\RowColumnInformation::class, 'COLUMNS'],
+            'argumentCount' => '1',
+        ],
+        'COMBIN' => [
+            'category' => Category::CATEGORY_MATH_AND_TRIG,
+            'functionCall' => [MathTrig\Combinations::class, 'withoutRepetition'],
+            'argumentCount' => '2',
+        ],
+        'COMBINA' => [
+            'category' => Category::CATEGORY_MATH_AND_TRIG,
+            'functionCall' => [MathTrig\Combinations::class, 'withRepetition'],
+            'argumentCount' => '2',
+        ],
+        'COMPLEX' => [
+            'category' => Category::CATEGORY_ENGINEERING,
+            'functionCall' => [Engineering\Complex::class, 'COMPLEX'],
+            'argumentCount' => '2,3',
+        ],
+        'CONCAT' => [
+            'category' => Category::CATEGORY_TEXT_AND_DATA,
+            'functionCall' => [TextData\Concatenate::class, 'CONCATENATE'],
+            'argumentCount' => '1+',
+        ],
+        'CONCATENATE' => [
+            'category' => Category::CATEGORY_TEXT_AND_DATA,
+            'functionCall' => [TextData\Concatenate::class, 'actualCONCATENATE'],
+            'argumentCount' => '1+',
+        ],
+        'CONFIDENCE' => [
+            'category' => Category::CATEGORY_STATISTICAL,
+            'functionCall' => [Statistical\Confidence::class, 'CONFIDENCE'],
+            'argumentCount' => '3',
+        ],
+        'CONFIDENCE.NORM' => [
+            'category' => Category::CATEGORY_STATISTICAL,
+            'functionCall' => [Statistical\Confidence::class, 'CONFIDENCE'],
+            'argumentCount' => '3',
+        ],
+        'CONFIDENCE.T' => [
+            'category' => Category::CATEGORY_STATISTICAL,
+            'functionCall' => [Functions::class, 'DUMMY'],
+            'argumentCount' => '3',
+        ],
+        'CONVERT' => [
+            'category' => Category::CATEGORY_ENGINEERING,
+            'functionCall' => [Engineering\ConvertUOM::class, 'CONVERT'],
+            'argumentCount' => '3',
+        ],
+        'CORREL' => [
+            'category' => Category::CATEGORY_STATISTICAL,
+            'functionCall' => [Statistical\Trends::class, 'CORREL'],
+            'argumentCount' => '2',
+        ],
+        'COS' => [
+            'category' => Category::CATEGORY_MATH_AND_TRIG,
+            'functionCall' => [MathTrig\Trig\Cosine::class, 'cos'],
+            'argumentCount' => '1',
+        ],
+        'COSH' => [
+            'category' => Category::CATEGORY_MATH_AND_TRIG,
+            'functionCall' => [MathTrig\Trig\Cosine::class, 'cosh'],
+            'argumentCount' => '1',
+        ],
+        'COT' => [
+            'category' => Category::CATEGORY_MATH_AND_TRIG,
+            'functionCall' => [MathTrig\Trig\Cotangent::class, 'cot'],
+            'argumentCount' => '1',
+        ],
+        'COTH' => [
+            'category' => Category::CATEGORY_MATH_AND_TRIG,
+            'functionCall' => [MathTrig\Trig\Cotangent::class, 'coth'],
+            'argumentCount' => '1',
+        ],
+        'COUNT' => [
+            'category' => Category::CATEGORY_STATISTICAL,
+            'functionCall' => [Statistical\Counts::class, 'COUNT'],
+            'argumentCount' => '1+',
+        ],
+        'COUNTA' => [
+            'category' => Category::CATEGORY_STATISTICAL,
+            'functionCall' => [Statistical\Counts::class, 'COUNTA'],
+            'argumentCount' => '1+',
+        ],
+        'COUNTBLANK' => [
+            'category' => Category::CATEGORY_STATISTICAL,
+            'functionCall' => [Statistical\Counts::class, 'COUNTBLANK'],
+            'argumentCount' => '1',
+        ],
+        'COUNTIF' => [
+            'category' => Category::CATEGORY_STATISTICAL,
+            'functionCall' => [Statistical\Conditional::class, 'COUNTIF'],
+            'argumentCount' => '2',
+        ],
+        'COUNTIFS' => [
+            'category' => Category::CATEGORY_STATISTICAL,
+            'functionCall' => [Statistical\Conditional::class, 'COUNTIFS'],
+            'argumentCount' => '2+',
+        ],
+        'COUPDAYBS' => [
+            'category' => Category::CATEGORY_FINANCIAL,
+            'functionCall' => [Financial\Coupons::class, 'COUPDAYBS'],
+            'argumentCount' => '3,4',
+        ],
+        'COUPDAYS' => [
+            'category' => Category::CATEGORY_FINANCIAL,
+            'functionCall' => [Financial\Coupons::class, 'COUPDAYS'],
+            'argumentCount' => '3,4',
+        ],
+        'COUPDAYSNC' => [
+            'category' => Category::CATEGORY_FINANCIAL,
+            'functionCall' => [Financial\Coupons::class, 'COUPDAYSNC'],
+            'argumentCount' => '3,4',
+        ],
+        'COUPNCD' => [
+            'category' => Category::CATEGORY_FINANCIAL,
+            'functionCall' => [Financial\Coupons::class, 'COUPNCD'],
+            'argumentCount' => '3,4',
+        ],
+        'COUPNUM' => [
+            'category' => Category::CATEGORY_FINANCIAL,
+            'functionCall' => [Financial\Coupons::class, 'COUPNUM'],
+            'argumentCount' => '3,4',
+        ],
+        'COUPPCD' => [
+            'category' => Category::CATEGORY_FINANCIAL,
+            'functionCall' => [Financial\Coupons::class, 'COUPPCD'],
+            'argumentCount' => '3,4',
+        ],
+        'COVAR' => [
+            'category' => Category::CATEGORY_STATISTICAL,
+            'functionCall' => [Statistical\Trends::class, 'COVAR'],
+            'argumentCount' => '2',
+        ],
+        'COVARIANCE.P' => [
+            'category' => Category::CATEGORY_STATISTICAL,
+            'functionCall' => [Statistical\Trends::class, 'COVAR'],
+            'argumentCount' => '2',
+        ],
+        'COVARIANCE.S' => [
+            'category' => Category::CATEGORY_STATISTICAL,
+            'functionCall' => [Functions::class, 'DUMMY'],
+            'argumentCount' => '2',
+        ],
+        'CRITBINOM' => [
+            'category' => Category::CATEGORY_STATISTICAL,
+            'functionCall' => [Statistical\Distributions\Binomial::class, 'inverse'],
+            'argumentCount' => '3',
+        ],
+        'CSC' => [
+            'category' => Category::CATEGORY_MATH_AND_TRIG,
+            'functionCall' => [MathTrig\Trig\Cosecant::class, 'csc'],
+            'argumentCount' => '1',
+        ],
+        'CSCH' => [
+            'category' => Category::CATEGORY_MATH_AND_TRIG,
+            'functionCall' => [MathTrig\Trig\Cosecant::class, 'csch'],
+            'argumentCount' => '1',
+        ],
+        'CUBEKPIMEMBER' => [
+            'category' => Category::CATEGORY_CUBE,
+            'functionCall' => [Functions::class, 'DUMMY'],
+            'argumentCount' => '?',
+        ],
+        'CUBEMEMBER' => [
+            'category' => Category::CATEGORY_CUBE,
+            'functionCall' => [Functions::class, 'DUMMY'],
+            'argumentCount' => '?',
+        ],
+        'CUBEMEMBERPROPERTY' => [
+            'category' => Category::CATEGORY_CUBE,
+            'functionCall' => [Functions::class, 'DUMMY'],
+            'argumentCount' => '?',
+        ],
+        'CUBERANKEDMEMBER' => [
+            'category' => Category::CATEGORY_CUBE,
+            'functionCall' => [Functions::class, 'DUMMY'],
+            'argumentCount' => '?',
+        ],
+        'CUBESET' => [
+            'category' => Category::CATEGORY_CUBE,
+            'functionCall' => [Functions::class, 'DUMMY'],
+            'argumentCount' => '?',
+        ],
+        'CUBESETCOUNT' => [
+            'category' => Category::CATEGORY_CUBE,
+            'functionCall' => [Functions::class, 'DUMMY'],
+            'argumentCount' => '?',
+        ],
+        'CUBEVALUE' => [
+            'category' => Category::CATEGORY_CUBE,
+            'functionCall' => [Functions::class, 'DUMMY'],
+            'argumentCount' => '?',
+        ],
+        'CUMIPMT' => [
+            'category' => Category::CATEGORY_FINANCIAL,
+            'functionCall' => [Financial\CashFlow\Constant\Periodic\Cumulative::class, 'interest'],
+            'argumentCount' => '6',
+        ],
+        'CUMPRINC' => [
+            'category' => Category::CATEGORY_FINANCIAL,
+            'functionCall' => [Financial\CashFlow\Constant\Periodic\Cumulative::class, 'principal'],
+            'argumentCount' => '6',
+        ],
+        'DATE' => [
+            'category' => Category::CATEGORY_DATE_AND_TIME,
+            'functionCall' => [DateTimeExcel\Date::class, 'fromYMD'],
+            'argumentCount' => '3',
+        ],
+        'DATEDIF' => [
+            'category' => Category::CATEGORY_DATE_AND_TIME,
+            'functionCall' => [DateTimeExcel\Difference::class, 'interval'],
+            'argumentCount' => '2,3',
+        ],
+        'DATESTRING' => [
+            'category' => Category::CATEGORY_DATE_AND_TIME,
+            'functionCall' => [Functions::class, 'DUMMY'],
+            'argumentCount' => '?',
+        ],
+        'DATEVALUE' => [
+            'category' => Category::CATEGORY_DATE_AND_TIME,
+            'functionCall' => [DateTimeExcel\DateValue::class, 'fromString'],
+            'argumentCount' => '1',
+        ],
+        'DAVERAGE' => [
+            'category' => Category::CATEGORY_DATABASE,
+            'functionCall' => [Database\DAverage::class, 'evaluate'],
+            'argumentCount' => '3',
+        ],
+        'DAY' => [
+            'category' => Category::CATEGORY_DATE_AND_TIME,
+            'functionCall' => [DateTimeExcel\DateParts::class, 'day'],
+            'argumentCount' => '1',
+        ],
+        'DAYS' => [
+            'category' => Category::CATEGORY_DATE_AND_TIME,
+            'functionCall' => [DateTimeExcel\Days::class, 'between'],
+            'argumentCount' => '2',
+        ],
+        'DAYS360' => [
+            'category' => Category::CATEGORY_DATE_AND_TIME,
+            'functionCall' => [DateTimeExcel\Days360::class, 'between'],
+            'argumentCount' => '2,3',
+        ],
+        'DB' => [
+            'category' => Category::CATEGORY_FINANCIAL,
+            'functionCall' => [Financial\Depreciation::class, 'DB'],
+            'argumentCount' => '4,5',
+        ],
+        'DBCS' => [
+            'category' => Category::CATEGORY_TEXT_AND_DATA,
+            'functionCall' => [Functions::class, 'DUMMY'],
+            'argumentCount' => '1',
+        ],
+        'DCOUNT' => [
+            'category' => Category::CATEGORY_DATABASE,
+            'functionCall' => [Database\DCount::class, 'evaluate'],
+            'argumentCount' => '3',
+        ],
+        'DCOUNTA' => [
+            'category' => Category::CATEGORY_DATABASE,
+            'functionCall' => [Database\DCountA::class, 'evaluate'],
+            'argumentCount' => '3',
+        ],
+        'DDB' => [
+            'category' => Category::CATEGORY_FINANCIAL,
+            'functionCall' => [Financial\Depreciation::class, 'DDB'],
+            'argumentCount' => '4,5',
+        ],
+        'DEC2BIN' => [
+            'category' => Category::CATEGORY_ENGINEERING,
+            'functionCall' => [Engineering\ConvertDecimal::class, 'toBinary'],
+            'argumentCount' => '1,2',
+        ],
+        'DEC2HEX' => [
+            'category' => Category::CATEGORY_ENGINEERING,
+            'functionCall' => [Engineering\ConvertDecimal::class, 'toHex'],
+            'argumentCount' => '1,2',
+        ],
+        'DEC2OCT' => [
+            'category' => Category::CATEGORY_ENGINEERING,
+            'functionCall' => [Engineering\ConvertDecimal::class, 'toOctal'],
+            'argumentCount' => '1,2',
+        ],
+        'DECIMAL' => [
+            'category' => Category::CATEGORY_MATH_AND_TRIG,
+            'functionCall' => [Functions::class, 'DUMMY'],
+            'argumentCount' => '2',
+        ],
+        'DEGREES' => [
+            'category' => Category::CATEGORY_MATH_AND_TRIG,
+            'functionCall' => [MathTrig\Angle::class, 'toDegrees'],
+            'argumentCount' => '1',
+        ],
+        'DELTA' => [
+            'category' => Category::CATEGORY_ENGINEERING,
+            'functionCall' => [Engineering\Compare::class, 'DELTA'],
+            'argumentCount' => '1,2',
+        ],
+        'DEVSQ' => [
+            'category' => Category::CATEGORY_STATISTICAL,
+            'functionCall' => [Statistical\Deviations::class, 'sumSquares'],
+            'argumentCount' => '1+',
+        ],
+        'DGET' => [
+            'category' => Category::CATEGORY_DATABASE,
+            'functionCall' => [Database\DGet::class, 'evaluate'],
+            'argumentCount' => '3',
+        ],
+        'DISC' => [
+            'category' => Category::CATEGORY_FINANCIAL,
+            'functionCall' => [Financial\Securities\Rates::class, 'discount'],
+            'argumentCount' => '4,5',
+        ],
+        'DMAX' => [
+            'category' => Category::CATEGORY_DATABASE,
+            'functionCall' => [Database\DMax::class, 'evaluate'],
+            'argumentCount' => '3',
+        ],
+        'DMIN' => [
+            'category' => Category::CATEGORY_DATABASE,
+            'functionCall' => [Database\DMin::class, 'evaluate'],
+            'argumentCount' => '3',
+        ],
+        'DOLLAR' => [
+            'category' => Category::CATEGORY_TEXT_AND_DATA,
+            'functionCall' => [TextData\Format::class, 'DOLLAR'],
+            'argumentCount' => '1,2',
+        ],
+        'DOLLARDE' => [
+            'category' => Category::CATEGORY_FINANCIAL,
+            'functionCall' => [Financial\Dollar::class, 'decimal'],
+            'argumentCount' => '2',
+        ],
+        'DOLLARFR' => [
+            'category' => Category::CATEGORY_FINANCIAL,
+            'functionCall' => [Financial\Dollar::class, 'fractional'],
+            'argumentCount' => '2',
+        ],
+        'DPRODUCT' => [
+            'category' => Category::CATEGORY_DATABASE,
+            'functionCall' => [Database\DProduct::class, 'evaluate'],
+            'argumentCount' => '3',
+        ],
+        'DROP' => [
+            'category' => Category::CATEGORY_LOOKUP_AND_REFERENCE,
+            'functionCall' => [LookupRef\ChooseRowsEtc::class, 'drop'],
+            'argumentCount' => '2-3',
+        ],
+        'DSTDEV' => [
+            'category' => Category::CATEGORY_DATABASE,
+            'functionCall' => [Database\DStDev::class, 'evaluate'],
+            'argumentCount' => '3',
+        ],
+        'DSTDEVP' => [
+            'category' => Category::CATEGORY_DATABASE,
+            'functionCall' => [Database\DStDevP::class, 'evaluate'],
+            'argumentCount' => '3',
+        ],
+        'DSUM' => [
+            'category' => Category::CATEGORY_DATABASE,
+            'functionCall' => [Database\DSum::class, 'evaluate'],
+            'argumentCount' => '3',
+        ],
+        'DURATION' => [
+            'category' => Category::CATEGORY_FINANCIAL,
+            'functionCall' => [Functions::class, 'DUMMY'],
+            'argumentCount' => '5,6',
+        ],
+        'DVAR' => [
+            'category' => Category::CATEGORY_DATABASE,
+            'functionCall' => [Database\DVar::class, 'evaluate'],
+            'argumentCount' => '3',
+        ],
+        'DVARP' => [
+            'category' => Category::CATEGORY_DATABASE,
+            'functionCall' => [Database\DVarP::class, 'evaluate'],
+            'argumentCount' => '3',
+        ],
+        'ECMA.CEILING' => [
+            'category' => Category::CATEGORY_MATH_AND_TRIG,
+            'functionCall' => [Functions::class, 'DUMMY'],
+            'argumentCount' => '1,2',
+        ],
+        'EDATE' => [
+            'category' => Category::CATEGORY_DATE_AND_TIME,
+            'functionCall' => [DateTimeExcel\Month::class, 'adjust'],
+            'argumentCount' => '2',
+        ],
+        'EFFECT' => [
+            'category' => Category::CATEGORY_FINANCIAL,
+            'functionCall' => [Financial\InterestRate::class, 'effective'],
+            'argumentCount' => '2',
+        ],
+        'ENCODEURL' => [
+            'category' => Category::CATEGORY_WEB,
+            'functionCall' => [Web\Service::class, 'urlEncode'],
+            'argumentCount' => '1',
+        ],
+        'EOMONTH' => [
+            'category' => Category::CATEGORY_DATE_AND_TIME,
+            'functionCall' => [DateTimeExcel\Month::class, 'lastDay'],
+            'argumentCount' => '2',
+        ],
+        'ERF' => [
+            'category' => Category::CATEGORY_ENGINEERING,
+            'functionCall' => [Engineering\Erf::class, 'ERF'],
+            'argumentCount' => '1,2',
+        ],
+        'ERF.PRECISE' => [
+            'category' => Category::CATEGORY_ENGINEERING,
+            'functionCall' => [Engineering\Erf::class, 'ERFPRECISE'],
+            'argumentCount' => '1',
+        ],
+        'ERFC' => [
+            'category' => Category::CATEGORY_ENGINEERING,
+            'functionCall' => [Engineering\ErfC::class, 'ERFC'],
+            'argumentCount' => '1',
+        ],
+        'ERFC.PRECISE' => [
+            'category' => Category::CATEGORY_ENGINEERING,
+            'functionCall' => [Engineering\ErfC::class, 'ERFC'],
+            'argumentCount' => '1',
+        ],
+        'ERROR.TYPE' => [
+            'category' => Category::CATEGORY_INFORMATION,
+            'functionCall' => [Information\ExcelError::class, 'type'],
+            'argumentCount' => '1',
+        ],
+        'EVEN' => [
+            'category' => Category::CATEGORY_MATH_AND_TRIG,
+            'functionCall' => [MathTrig\Round::class, 'even'],
+            'argumentCount' => '1',
+        ],
+        'EXACT' => [
+            'category' => Category::CATEGORY_TEXT_AND_DATA,
+            'functionCall' => [TextData\Text::class, 'exact'],
+            'argumentCount' => '2',
+        ],
+        'EXP' => [
+            'category' => Category::CATEGORY_MATH_AND_TRIG,
+            'functionCall' => [MathTrig\Exp::class, 'evaluate'],
+            'argumentCount' => '1',
+        ],
+        'EXPAND' => [
+            'category' => Category::CATEGORY_LOOKUP_AND_REFERENCE,
+            'functionCall' => [LookupRef\ChooseRowsEtc::class, 'expand'],
+            'argumentCount' => '2-4',
+        ],
+        'EXPONDIST' => [
+            'category' => Category::CATEGORY_STATISTICAL,
+            'functionCall' => [Statistical\Distributions\Exponential::class, 'distribution'],
+            'argumentCount' => '3',
+        ],
+        'EXPON.DIST' => [
+            'category' => Category::CATEGORY_STATISTICAL,
+            'functionCall' => [Statistical\Distributions\Exponential::class, 'distribution'],
+            'argumentCount' => '3',
+        ],
+        'FACT' => [
+            'category' => Category::CATEGORY_MATH_AND_TRIG,
+            'functionCall' => [MathTrig\Factorial::class, 'fact'],
+            'argumentCount' => '1',
+        ],
+        'FACTDOUBLE' => [
+            'category' => Category::CATEGORY_MATH_AND_TRIG,
+            'functionCall' => [MathTrig\Factorial::class, 'factDouble'],
+            'argumentCount' => '1',
+        ],
+        'FALSE' => [
+            'category' => Category::CATEGORY_LOGICAL,
+            'functionCall' => [Logical\Boolean::class, 'FALSE'],
+            'argumentCount' => '0',
+        ],
+        'FDIST' => [
+            'category' => Category::CATEGORY_STATISTICAL,
+            'functionCall' => [Functions::class, 'DUMMY'],
+            'argumentCount' => '3',
+        ],
+        'F.DIST' => [
+            'category' => Category::CATEGORY_STATISTICAL,
+            'functionCall' => [Statistical\Distributions\F::class, 'distribution'],
+            'argumentCount' => '4',
+        ],
+        'F.DIST.RT' => [
+            'category' => Category::CATEGORY_STATISTICAL,
+            'functionCall' => [Functions::class, 'DUMMY'],
+            'argumentCount' => '3',
+        ],
+        'FILTER' => [
+            'category' => Category::CATEGORY_LOOKUP_AND_REFERENCE,
+            'functionCall' => [LookupRef\Filter::class, 'filter'],
+            'argumentCount' => '2-3',
+        ],
+        'FILTERXML' => [
+            'category' => Category::CATEGORY_WEB,
+            'functionCall' => [Functions::class, 'DUMMY'],
+            'argumentCount' => '2',
+        ],
+        'FIND' => [
+            'category' => Category::CATEGORY_TEXT_AND_DATA,
+            'functionCall' => [TextData\Search::class, 'sensitive'],
+            'argumentCount' => '2,3',
+        ],
+        'FINDB' => [
+            'category' => Category::CATEGORY_TEXT_AND_DATA,
+            'functionCall' => [TextData\Search::class, 'sensitive'],
+            'argumentCount' => '2,3',
+        ],
+        'FINV' => [
+            'category' => Category::CATEGORY_STATISTICAL,
+            'functionCall' => [Functions::class, 'DUMMY'],
+            'argumentCount' => '3',
+        ],
+        'F.INV' => [
+            'category' => Category::CATEGORY_STATISTICAL,
+            'functionCall' => [Functions::class, 'DUMMY'],
+            'argumentCount' => '3',
+        ],
+        'F.INV.RT' => [
+            'category' => Category::CATEGORY_STATISTICAL,
+            'functionCall' => [Functions::class, 'DUMMY'],
+            'argumentCount' => '3',
+        ],
+        'FISHER' => [
+            'category' => Category::CATEGORY_STATISTICAL,
+            'functionCall' => [Statistical\Distributions\Fisher::class, 'distribution'],
+            'argumentCount' => '1',
+        ],
+        'FISHERINV' => [
+            'category' => Category::CATEGORY_STATISTICAL,
+            'functionCall' => [Statistical\Distributions\Fisher::class, 'inverse'],
+            'argumentCount' => '1',
+        ],
+        'FIXED' => [
+            'category' => Category::CATEGORY_TEXT_AND_DATA,
+            'functionCall' => [TextData\Format::class, 'FIXEDFORMAT'],
+            'argumentCount' => '1-3',
+        ],
+        'FLOOR' => [
+            'category' => Category::CATEGORY_MATH_AND_TRIG,
+            'functionCall' => [MathTrig\Floor::class, 'floor'],
+            'argumentCount' => '1-2', // Excel requries 2, Ods/Gnumeric 1-2
+        ],
+        'FLOOR.MATH' => [
+            'category' => Category::CATEGORY_MATH_AND_TRIG,
+            'functionCall' => [MathTrig\Floor::class, 'math'],
+            'argumentCount' => '1-3',
+        ],
+        'FLOOR.PRECISE' => [
+            'category' => Category::CATEGORY_MATH_AND_TRIG,
+            'functionCall' => [MathTrig\Floor::class, 'precise'],
+            'argumentCount' => '1-2',
+        ],
+        'FORECAST' => [
+            'category' => Category::CATEGORY_STATISTICAL,
+            'functionCall' => [Statistical\Trends::class, 'FORECAST'],
+            'argumentCount' => '3',
+        ],
+        'FORECAST.ETS' => [
+            'category' => Category::CATEGORY_STATISTICAL,
+            'functionCall' => [Functions::class, 'DUMMY'],
+            'argumentCount' => '3-6',
+        ],
+        'FORECAST.ETS.CONFINT' => [
+            'category' => Category::CATEGORY_STATISTICAL,
+            'functionCall' => [Functions::class, 'DUMMY'],
+            'argumentCount' => '3-6',
+        ],
+        'FORECAST.ETS.SEASONALITY' => [
+            'category' => Category::CATEGORY_STATISTICAL,
+            'functionCall' => [Functions::class, 'DUMMY'],
+            'argumentCount' => '2-4',
+        ],
+        'FORECAST.ETS.STAT' => [
+            'category' => Category::CATEGORY_STATISTICAL,
+            'functionCall' => [Functions::class, 'DUMMY'],
+            'argumentCount' => '3-6',
+        ],
+        'FORECAST.LINEAR' => [
+            'category' => Category::CATEGORY_STATISTICAL,
+            'functionCall' => [Statistical\Trends::class, 'FORECAST'],
+            'argumentCount' => '3',
+        ],
+        'FORMULATEXT' => [
+            'category' => Category::CATEGORY_LOOKUP_AND_REFERENCE,
+            'functionCall' => [LookupRef\Formula::class, 'text'],
+            'argumentCount' => '1',
+            'passCellReference' => true,
+            'passByReference' => [true],
+        ],
+        'FREQUENCY' => [
+            'category' => Category::CATEGORY_STATISTICAL,
+            'functionCall' => [Functions::class, 'DUMMY'],
+            'argumentCount' => '2',
+        ],
+        'FTEST' => [
+            'category' => Category::CATEGORY_STATISTICAL,
+            'functionCall' => [Functions::class, 'DUMMY'],
+            'argumentCount' => '2',
+        ],
+        'F.TEST' => [
+            'category' => Category::CATEGORY_STATISTICAL,
+            'functionCall' => [Functions::class, 'DUMMY'],
+            'argumentCount' => '2',
+        ],
+        'FV' => [
+            'category' => Category::CATEGORY_FINANCIAL,
+            'functionCall' => [Financial\CashFlow\Constant\Periodic::class, 'futureValue'],
+            'argumentCount' => '3-5',
+        ],
+        'FVSCHEDULE' => [
+            'category' => Category::CATEGORY_FINANCIAL,
+            'functionCall' => [Financial\CashFlow\Single::class, 'futureValue'],
+            'argumentCount' => '2',
+        ],
+        'GAMMA' => [
+            'category' => Category::CATEGORY_STATISTICAL,
+            'functionCall' => [Statistical\Distributions\Gamma::class, 'gamma'],
+            'argumentCount' => '1',
+        ],
+        'GAMMADIST' => [
+            'category' => Category::CATEGORY_STATISTICAL,
+            'functionCall' => [Statistical\Distributions\Gamma::class, 'distribution'],
+            'argumentCount' => '4',
+        ],
+        'GAMMA.DIST' => [
+            'category' => Category::CATEGORY_STATISTICAL,
+            'functionCall' => [Statistical\Distributions\Gamma::class, 'distribution'],
+            'argumentCount' => '4',
+        ],
+        'GAMMAINV' => [
+            'category' => Category::CATEGORY_STATISTICAL,
+            'functionCall' => [Statistical\Distributions\Gamma::class, 'inverse'],
+            'argumentCount' => '3',
+        ],
+        'GAMMA.INV' => [
+            'category' => Category::CATEGORY_STATISTICAL,
+            'functionCall' => [Statistical\Distributions\Gamma::class, 'inverse'],
+            'argumentCount' => '3',
+        ],
+        'GAMMALN' => [
+            'category' => Category::CATEGORY_STATISTICAL,
+            'functionCall' => [Statistical\Distributions\Gamma::class, 'ln'],
+            'argumentCount' => '1',
+        ],
+        'GAMMALN.PRECISE' => [
+            'category' => Category::CATEGORY_STATISTICAL,
+            'functionCall' => [Statistical\Distributions\Gamma::class, 'ln'],
+            'argumentCount' => '1',
+        ],
+        'GAUSS' => [
+            'category' => Category::CATEGORY_STATISTICAL,
+            'functionCall' => [Statistical\Distributions\StandardNormal::class, 'gauss'],
+            'argumentCount' => '1',
+        ],
+        'GCD' => [
+            'category' => Category::CATEGORY_MATH_AND_TRIG,
+            'functionCall' => [MathTrig\Gcd::class, 'evaluate'],
+            'argumentCount' => '1+',
+        ],
+        'GEOMEAN' => [
+            'category' => Category::CATEGORY_STATISTICAL,
+            'functionCall' => [Statistical\Averages\Mean::class, 'geometric'],
+            'argumentCount' => '1+',
+        ],
+        'GESTEP' => [
+            'category' => Category::CATEGORY_ENGINEERING,
+            'functionCall' => [Engineering\Compare::class, 'GESTEP'],
+            'argumentCount' => '1,2',
+        ],
+        'GETPIVOTDATA' => [
+            'category' => Category::CATEGORY_LOOKUP_AND_REFERENCE,
+            'functionCall' => [Functions::class, 'DUMMY'],
+            'argumentCount' => '2+',
+        ],
+        'GROUPBY' => [
+            'category' => Category::CATEGORY_LOOKUP_AND_REFERENCE,
+            'functionCall' => [Functions::class, 'DUMMY'],
+            'argumentCount' => '3-7',
+        ],
+        'GROWTH' => [
+            'category' => Category::CATEGORY_STATISTICAL,
+            'functionCall' => [Statistical\Trends::class, 'GROWTH'],
+            'argumentCount' => '1-4',
+        ],
+        'HARMEAN' => [
+            'category' => Category::CATEGORY_STATISTICAL,
+            'functionCall' => [Statistical\Averages\Mean::class, 'harmonic'],
+            'argumentCount' => '1+',
+        ],
+        'HEX2BIN' => [
+            'category' => Category::CATEGORY_ENGINEERING,
+            'functionCall' => [Engineering\ConvertHex::class, 'toBinary'],
+            'argumentCount' => '1,2',
+        ],
+        'HEX2DEC' => [
+            'category' => Category::CATEGORY_ENGINEERING,
+            'functionCall' => [Engineering\ConvertHex::class, 'toDecimal'],
+            'argumentCount' => '1',
+        ],
+        'HEX2OCT' => [
+            'category' => Category::CATEGORY_ENGINEERING,
+            'functionCall' => [Engineering\ConvertHex::class, 'toOctal'],
+            'argumentCount' => '1,2',
+        ],
+        'HLOOKUP' => [
+            'category' => Category::CATEGORY_LOOKUP_AND_REFERENCE,
+            'functionCall' => [LookupRef\HLookup::class, 'lookup'],
+            'argumentCount' => '3,4',
+        ],
+        'HOUR' => [
+            'category' => Category::CATEGORY_DATE_AND_TIME,
+            'functionCall' => [DateTimeExcel\TimeParts::class, 'hour'],
+            'argumentCount' => '1',
+        ],
+        'HSTACK' => [
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+            'functionCall' => [Functions::class, 'DUMMY'],
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+        'SUMSQ' => [
+            'category' => Category::CATEGORY_MATH_AND_TRIG,
+            'functionCall' => [MathTrig\SumSquares::class, 'sumSquare'],
+            'argumentCount' => '1+',
+        ],
+        'SUMX2MY2' => [
+            'category' => Category::CATEGORY_MATH_AND_TRIG,
+            'functionCall' => [MathTrig\SumSquares::class, 'sumXSquaredMinusYSquared'],
+            'argumentCount' => '2',
+        ],
+        'SUMX2PY2' => [
+            'category' => Category::CATEGORY_MATH_AND_TRIG,
+            'functionCall' => [MathTrig\SumSquares::class, 'sumXSquaredPlusYSquared'],
+            'argumentCount' => '2',
+        ],
+        'SUMXMY2' => [
+            'category' => Category::CATEGORY_MATH_AND_TRIG,
+            'functionCall' => [MathTrig\SumSquares::class, 'sumXMinusYSquared'],
+            'argumentCount' => '2',
+        ],
+        'SWITCH' => [
+            'category' => Category::CATEGORY_LOGICAL,
+            'functionCall' => [Logical\Conditional::class, 'statementSwitch'],
+            'argumentCount' => '3+',
+        ],
+        'SYD' => [
+            'category' => Category::CATEGORY_FINANCIAL,
+            'functionCall' => [Financial\Depreciation::class, 'SYD'],
+            'argumentCount' => '4',
+        ],
+        'T' => [
+            'category' => Category::CATEGORY_TEXT_AND_DATA,
+            'functionCall' => [TextData\Text::class, 'test'],
+            'argumentCount' => '1',
+        ],
+        'TAKE' => [
+            'category' => Category::CATEGORY_LOOKUP_AND_REFERENCE,
+            'functionCall' => [LookupRef\ChooseRowsEtc::class, 'take'],
+            'argumentCount' => '2-3',
+        ],
+        'TAN' => [
+            'category' => Category::CATEGORY_MATH_AND_TRIG,
+            'functionCall' => [MathTrig\Trig\Tangent::class, 'tan'],
+            'argumentCount' => '1',
+        ],
+        'TANH' => [
+            'category' => Category::CATEGORY_MATH_AND_TRIG,
+            'functionCall' => [MathTrig\Trig\Tangent::class, 'tanh'],
+            'argumentCount' => '1',
+        ],
+        'TBILLEQ' => [
+            'category' => Category::CATEGORY_FINANCIAL,
+            'functionCall' => [Financial\TreasuryBill::class, 'bondEquivalentYield'],
+            'argumentCount' => '3',
+        ],
+        'TBILLPRICE' => [
+            'category' => Category::CATEGORY_FINANCIAL,
+            'functionCall' => [Financial\TreasuryBill::class, 'price'],
+            'argumentCount' => '3',
+        ],
+        'TBILLYIELD' => [
+            'category' => Category::CATEGORY_FINANCIAL,
+            'functionCall' => [Financial\TreasuryBill::class, 'yield'],
+            'argumentCount' => '3',
+        ],
+        'TDIST' => [
+            'category' => Category::CATEGORY_STATISTICAL,
+            'functionCall' => [Statistical\Distributions\StudentT::class, 'distribution'],
+            'argumentCount' => '3',
+        ],
+        'T.DIST' => [
+            'category' => Category::CATEGORY_STATISTICAL,
+            'functionCall' => [Functions::class, 'DUMMY'],
+            'argumentCount' => '3',
+        ],
+        'T.DIST.2T' => [
+            'category' => Category::CATEGORY_STATISTICAL,
+            'functionCall' => [Functions::class, 'DUMMY'],
+            'argumentCount' => '2',
+        ],
+        'T.DIST.RT' => [
+            'category' => Category::CATEGORY_STATISTICAL,
+            'functionCall' => [Functions::class, 'DUMMY'],
+            'argumentCount' => '2',
+        ],
+        'TEXT' => [
+            'category' => Category::CATEGORY_TEXT_AND_DATA,
+            'functionCall' => [TextData\Format::class, 'TEXTFORMAT'],
+            'argumentCount' => '2',
+        ],
+        'TEXTAFTER' => [
+            'category' => Category::CATEGORY_TEXT_AND_DATA,
+            'functionCall' => [TextData\Extract::class, 'after'],
+            'argumentCount' => '2-6',
+        ],
+        'TEXTBEFORE' => [
+            'category' => Category::CATEGORY_TEXT_AND_DATA,
+            'functionCall' => [TextData\Extract::class, 'before'],
+            'argumentCount' => '2-6',
+        ],
+        'TEXTJOIN' => [
+            'category' => Category::CATEGORY_TEXT_AND_DATA,
+            'functionCall' => [TextData\Concatenate::class, 'TEXTJOIN'],
+            'argumentCount' => '3+',
+        ],
+        'TEXTSPLIT' => [
+            'category' => Category::CATEGORY_TEXT_AND_DATA,
+            'functionCall' => [TextData\Text::class, 'split'],
+            'argumentCount' => '2-6',
+        ],
+        'THAIDAYOFWEEK' => [
+            'category' => Category::CATEGORY_DATE_AND_TIME,
+            'functionCall' => [Functions::class, 'DUMMY'],
+            'argumentCount' => '?',
+        ],
+        'THAIDIGIT' => [
+            'category' => Category::CATEGORY_TEXT_AND_DATA,
+            'functionCall' => [Functions::class, 'DUMMY'],
+            'argumentCount' => '?',
+        ],
+        'THAIMONTHOFYEAR' => [
+            'category' => Category::CATEGORY_DATE_AND_TIME,
+            'functionCall' => [Functions::class, 'DUMMY'],
+            'argumentCount' => '?',
+        ],
+        'THAINUMSOUND' => [
+            'category' => Category::CATEGORY_TEXT_AND_DATA,
+            'functionCall' => [Functions::class, 'DUMMY'],
+            'argumentCount' => '?',
+        ],
+        'THAINUMSTRING' => [
+            'category' => Category::CATEGORY_TEXT_AND_DATA,
+            'functionCall' => [Functions::class, 'DUMMY'],
+            'argumentCount' => '?',
+        ],
+        'THAISTRINGLENGTH' => [
+            'category' => Category::CATEGORY_TEXT_AND_DATA,
+            'functionCall' => [Functions::class, 'DUMMY'],
+            'argumentCount' => '?',
+        ],
+        'THAIYEAR' => [
+            'category' => Category::CATEGORY_DATE_AND_TIME,
+            'functionCall' => [Functions::class, 'DUMMY'],
+            'argumentCount' => '?',
+        ],
+        'TIME' => [
+            'category' => Category::CATEGORY_DATE_AND_TIME,
+            'functionCall' => [DateTimeExcel\Time::class, 'fromHMS'],
+            'argumentCount' => '3',
+        ],
+        'TIMEVALUE' => [
+            'category' => Category::CATEGORY_DATE_AND_TIME,
+            'functionCall' => [DateTimeExcel\TimeValue::class, 'fromString'],
+            'argumentCount' => '1',
+        ],
+        'TINV' => [
+            'category' => Category::CATEGORY_STATISTICAL,
+            'functionCall' => [Statistical\Distributions\StudentT::class, 'inverse'],
+            'argumentCount' => '2',
+        ],
+        'T.INV' => [
+            'category' => Category::CATEGORY_STATISTICAL,
+            'functionCall' => [Statistical\Distributions\StudentT::class, 'inverse'],
+            'argumentCount' => '2',
+        ],
+        'T.INV.2T' => [
+            'category' => Category::CATEGORY_STATISTICAL,
+            'functionCall' => [Functions::class, 'DUMMY'],
+            'argumentCount' => '2',
+        ],
+        'TODAY' => [
+            'category' => Category::CATEGORY_DATE_AND_TIME,
+            'functionCall' => [DateTimeExcel\Current::class, 'today'],
+            'argumentCount' => '0',
+        ],
+        'TOCOL' => [
+            'category' => Category::CATEGORY_MATH_AND_TRIG,
+            'functionCall' => [Functions::class, 'DUMMY'],
+            'argumentCount' => '1-3',
+        ],
+        'TOROW' => [
+            'category' => Category::CATEGORY_MATH_AND_TRIG,
+            'functionCall' => [Functions::class, 'DUMMY'],
+            'argumentCount' => '1-3',
+        ],
+        'TRANSPOSE' => [
+            'category' => Category::CATEGORY_LOOKUP_AND_REFERENCE,
+            'functionCall' => [LookupRef\Matrix::class, 'transpose'],
+            'argumentCount' => '1',
+        ],
+        'TREND' => [
+            'category' => Category::CATEGORY_STATISTICAL,
+            'functionCall' => [Statistical\Trends::class, 'TREND'],
+            'argumentCount' => '1-4',
+        ],
+        'TRIM' => [
+            'category' => Category::CATEGORY_TEXT_AND_DATA,
+            'functionCall' => [TextData\Trim::class, 'spaces'],
+            'argumentCount' => '1',
+        ],
+        'TRIMMEAN' => [
+            'category' => Category::CATEGORY_STATISTICAL,
+            'functionCall' => [Statistical\Averages\Mean::class, 'trim'],
+            'argumentCount' => '2',
+        ],
+        'TRUE' => [
+            'category' => Category::CATEGORY_LOGICAL,
+            'functionCall' => [Logical\Boolean::class, 'TRUE'],
+            'argumentCount' => '0',
+        ],
+        'TRUNC' => [
+            'category' => Category::CATEGORY_MATH_AND_TRIG,
+            'functionCall' => [MathTrig\Trunc::class, 'evaluate'],
+            'argumentCount' => '1,2',
+        ],
+        'TTEST' => [
+            'category' => Category::CATEGORY_STATISTICAL,
+            'functionCall' => [Functions::class, 'DUMMY'],
+            'argumentCount' => '4',
+        ],
+        'T.TEST' => [
+            'category' => Category::CATEGORY_STATISTICAL,
+            'functionCall' => [Functions::class, 'DUMMY'],
+            'argumentCount' => '4',
+        ],
+        'TYPE' => [
+            'category' => Category::CATEGORY_INFORMATION,
+            'functionCall' => [Information\Value::class, 'type'],
+            'argumentCount' => '1',
+        ],
+        'UNICHAR' => [
+            'category' => Category::CATEGORY_TEXT_AND_DATA,
+            'functionCall' => [TextData\CharacterConvert::class, 'character'],
+            'argumentCount' => '1',
+        ],
+        'UNICODE' => [
+            'category' => Category::CATEGORY_TEXT_AND_DATA,
+            'functionCall' => [TextData\CharacterConvert::class, 'code'],
+            'argumentCount' => '1',
+        ],
+        'UNIQUE' => [
+            'category' => Category::CATEGORY_LOOKUP_AND_REFERENCE,
+            'functionCall' => [LookupRef\Unique::class, 'unique'],
+            'argumentCount' => '1+',
+        ],
+        'UPPER' => [
+            'category' => Category::CATEGORY_TEXT_AND_DATA,
+            'functionCall' => [TextData\CaseConvert::class, 'upper'],
+            'argumentCount' => '1',
+        ],
+        'USDOLLAR' => [
+            'category' => Category::CATEGORY_FINANCIAL,
+            'functionCall' => [Financial\Dollar::class, 'format'],
+            'argumentCount' => '2',
+        ],
+        'VALUE' => [
+            'category' => Category::CATEGORY_TEXT_AND_DATA,
+            'functionCall' => [TextData\Format::class, 'VALUE'],
+            'argumentCount' => '1',
+        ],
+        'VALUETOTEXT' => [
+            'category' => Category::CATEGORY_TEXT_AND_DATA,
+            'functionCall' => [TextData\Format::class, 'valueToText'],
+            'argumentCount' => '1,2',
+        ],
+        'VAR' => [
+            'category' => Category::CATEGORY_STATISTICAL,
+            'functionCall' => [Statistical\Variances::class, 'VAR'],
+            'argumentCount' => '1+',
+        ],
+        'VAR.P' => [
+            'category' => Category::CATEGORY_STATISTICAL,
+            'functionCall' => [Statistical\Variances::class, 'VARP'],
+            'argumentCount' => '1+',
+        ],
+        'VAR.S' => [
+            'category' => Category::CATEGORY_STATISTICAL,
+            'functionCall' => [Statistical\Variances::class, 'VAR'],
+            'argumentCount' => '1+',
+        ],
+        'VARA' => [
+            'category' => Category::CATEGORY_STATISTICAL,
+            'functionCall' => [Statistical\Variances::class, 'VARA'],
+            'argumentCount' => '1+',
+        ],
+        'VARP' => [
+            'category' => Category::CATEGORY_STATISTICAL,
+            'functionCall' => [Statistical\Variances::class, 'VARP'],
+            'argumentCount' => '1+',
+        ],
+        'VARPA' => [
+            'category' => Category::CATEGORY_STATISTICAL,
+            'functionCall' => [Statistical\Variances::class, 'VARPA'],
+            'argumentCount' => '1+',
+        ],
+        'VDB' => [
+            'category' => Category::CATEGORY_FINANCIAL,
+            'functionCall' => [Functions::class, 'DUMMY'],
+            'argumentCount' => '5-7',
+        ],
+        'VLOOKUP' => [
+            'category' => Category::CATEGORY_LOOKUP_AND_REFERENCE,
+            'functionCall' => [LookupRef\VLookup::class, 'lookup'],
+            'argumentCount' => '3,4',
+        ],
+        'VSTACK' => [
+            'category' => Category::CATEGORY_MATH_AND_TRIG,
+            'functionCall' => [Functions::class, 'DUMMY'],
+            'argumentCount' => '1+',
+        ],
+        'WEBSERVICE' => [
+            'category' => Category::CATEGORY_WEB,
+            'functionCall' => [Web\Service::class, 'webService'],
+            'argumentCount' => '1',
+        ],
+        'WEEKDAY' => [
+            'category' => Category::CATEGORY_DATE_AND_TIME,
+            'functionCall' => [DateTimeExcel\Week::class, 'day'],
+            'argumentCount' => '1,2',
+        ],
+        'WEEKNUM' => [
+            'category' => Category::CATEGORY_DATE_AND_TIME,
+            'functionCall' => [DateTimeExcel\Week::class, 'number'],
+            'argumentCount' => '1,2',
+        ],
+        'WEIBULL' => [
+            'category' => Category::CATEGORY_STATISTICAL,
+            'functionCall' => [Statistical\Distributions\Weibull::class, 'distribution'],
+            'argumentCount' => '4',
+        ],
+        'WEIBULL.DIST' => [
+            'category' => Category::CATEGORY_STATISTICAL,
+            'functionCall' => [Statistical\Distributions\Weibull::class, 'distribution'],
+            'argumentCount' => '4',
+        ],
+        'WORKDAY' => [
+            'category' => Category::CATEGORY_DATE_AND_TIME,
+            'functionCall' => [DateTimeExcel\WorkDay::class, 'date'],
+            'argumentCount' => '2-3',
+        ],
+        'WORKDAY.INTL' => [
+            'category' => Category::CATEGORY_DATE_AND_TIME,
+            'functionCall' => [Functions::class, 'DUMMY'],
+            'argumentCount' => '2-4',
+        ],
+        'WRAPCOLS' => [
+            'category' => Category::CATEGORY_MATH_AND_TRIG,
+            'functionCall' => [Functions::class, 'DUMMY'],
+            'argumentCount' => '2-3',
+        ],
+        'WRAPROWS' => [
+            'category' => Category::CATEGORY_MATH_AND_TRIG,
+            'functionCall' => [Functions::class, 'DUMMY'],
+            'argumentCount' => '2-3',
+        ],
+        'XIRR' => [
+            'category' => Category::CATEGORY_FINANCIAL,
+            'functionCall' => [Financial\CashFlow\Variable\NonPeriodic::class, 'rate'],
+            'argumentCount' => '2,3',
+        ],
+        'XLOOKUP' => [
+            'category' => Category::CATEGORY_LOOKUP_AND_REFERENCE,
+            'functionCall' => [Functions::class, 'DUMMY'],
+            'argumentCount' => '3-6',
+        ],
+        'XNPV' => [
+            'category' => Category::CATEGORY_FINANCIAL,
+            'functionCall' => [Financial\CashFlow\Variable\NonPeriodic::class, 'presentValue'],
+            'argumentCount' => '3',
+        ],
+        'XMATCH' => [
+            'category' => Category::CATEGORY_LOOKUP_AND_REFERENCE,
+            'functionCall' => [Functions::class, 'DUMMY'],
+            'argumentCount' => '2,3',
+        ],
+        'XOR' => [
+            'category' => Category::CATEGORY_LOGICAL,
+            'functionCall' => [Logical\Operations::class, 'logicalXor'],
+            'argumentCount' => '1+',
+        ],
+        'YEAR' => [
+            'category' => Category::CATEGORY_DATE_AND_TIME,
+            'functionCall' => [DateTimeExcel\DateParts::class, 'year'],
+            'argumentCount' => '1',
+        ],
+        'YEARFRAC' => [
+            'category' => Category::CATEGORY_DATE_AND_TIME,
+            'functionCall' => [DateTimeExcel\YearFrac::class, 'fraction'],
+            'argumentCount' => '2,3',
+        ],
+        'YIELD' => [
+            'category' => Category::CATEGORY_FINANCIAL,
+            'functionCall' => [Functions::class, 'DUMMY'],
+            'argumentCount' => '6,7',
+        ],
+        'YIELDDISC' => [
+            'category' => Category::CATEGORY_FINANCIAL,
+            'functionCall' => [Financial\Securities\Yields::class, 'yieldDiscounted'],
+            'argumentCount' => '4,5',
+        ],
+        'YIELDMAT' => [
+            'category' => Category::CATEGORY_FINANCIAL,
+            'functionCall' => [Financial\Securities\Yields::class, 'yieldAtMaturity'],
+            'argumentCount' => '5,6',
+        ],
+        'ZTEST' => [
+            'category' => Category::CATEGORY_STATISTICAL,
+            'functionCall' => [Statistical\Distributions\StandardNormal::class, 'zTest'],
+            'argumentCount' => '2-3',
+        ],
+        'Z.TEST' => [
+            'category' => Category::CATEGORY_STATISTICAL,
+            'functionCall' => [Statistical\Distributions\StandardNormal::class, 'zTest'],
+            'argumentCount' => '2-3',
+        ],
+    ];
+}
diff --git a/tests/PhpSpreadsheetTests/Calculation/CustomFunction.php b/tests/PhpSpreadsheetTests/Calculation/CustomFunction.php
new file mode 100644
index 0000000000..1ce5cf5d27
--- /dev/null
+++ b/tests/PhpSpreadsheetTests/Calculation/CustomFunction.php
@@ -0,0 +1,22 @@
+<?php
+
+declare(strict_types=1);
+
+namespace PhpOffice\PhpSpreadsheetTests\Calculation;
+
+use PhpOffice\PhpSpreadsheet\Calculation\Exception as CalcException;
+use PhpOffice\PhpSpreadsheet\Calculation\MathTrig\Helpers;
+
+class CustomFunction
+{
+    public static function fourthPower(mixed $number): float|int|string
+    {
+        try {
+            $number = Helpers::validateNumericNullBool($number);
+        } catch (CalcException $e) {
+            return $e->getMessage();
+        }
+
+        return $number ** 4;
+    }
+}
diff --git a/tests/PhpSpreadsheetTests/Calculation/CustomFunctionTest.php b/tests/PhpSpreadsheetTests/Calculation/CustomFunctionTest.php
new file mode 100644
index 0000000000..b373dec1b5
--- /dev/null
+++ b/tests/PhpSpreadsheetTests/Calculation/CustomFunctionTest.php
@@ -0,0 +1,35 @@
+<?php
+
+declare(strict_types=1);
+
+namespace PhpOffice\PhpSpreadsheetTests\Calculation;
+
+use PhpOffice\PhpSpreadsheet\Calculation\Calculation;
+use PHPUnit\Framework\TestCase;
+
+class CustomFunctionTest extends TestCase
+{
+    public static function testCustomFunction(): void
+    {
+        $calculation = Calculation::getInstance();
+        $key = 'FOURTHPOWER';
+        // I have no idea why Phpstan needs this
+        /** @var array<string, array> */
+        $value = [
+            'category' => 'custom',
+            'functionCall' => [CustomFunction::class, 'fourthPower'],
+            'argumentCount' => '1',
+        ];
+        self::assertTrue(Calculation::addFunction($key, $value));
+        self::assertSame(16, $calculation->calculateFormula('=FOURTHPOWER(2)'));
+        self::assertSame('#VALUE!', $calculation->calculateFormula('=FOURTHPOWER("X")'));
+        self::assertSame('#NAME?', $calculation->calculateFormula('=FOURTHPOWE("X")'));
+        self::assertFalse(Calculation::removeFunction('SQRT'));
+        self::assertSame(2.0, $calculation->calculateFormula('=SQRT(4)'));
+        self::assertFalse(Calculation::removeFunction('sqrt'));
+        self::assertSame(4.0, $calculation->calculateFormula('=sqrt(16)'));
+        self::assertTrue(Calculation::removeFunction($key));
+        self::assertSame('#NAME?', $calculation->calculateFormula('=FOURTHPOWER(3)'));
+        self::assertFalse(Calculation::removeFunction('WHATEVER'));
+    }
+}

From c0a966b9bb7d2fa764510ddafb7eac0b91d80c18 Mon Sep 17 00:00:00 2001
From: oleibman <10341515+oleibman@users.noreply.github.com>
Date: Thu, 6 Mar 2025 16:40:09 -0800
Subject: [PATCH 2/2] Add a Test

Prove you can't override a built-in function.
---
 tests/PhpSpreadsheetTests/Calculation/CustomFunctionTest.php | 1 +
 1 file changed, 1 insertion(+)

diff --git a/tests/PhpSpreadsheetTests/Calculation/CustomFunctionTest.php b/tests/PhpSpreadsheetTests/Calculation/CustomFunctionTest.php
index b373dec1b5..944ad4565e 100644
--- a/tests/PhpSpreadsheetTests/Calculation/CustomFunctionTest.php
+++ b/tests/PhpSpreadsheetTests/Calculation/CustomFunctionTest.php
@@ -21,6 +21,7 @@ public static function testCustomFunction(): void
             'argumentCount' => '1',
         ];
         self::assertTrue(Calculation::addFunction($key, $value));
+        self::assertFalse(Calculation::addFunction('sqrt', $value));
         self::assertSame(16, $calculation->calculateFormula('=FOURTHPOWER(2)'));
         self::assertSame('#VALUE!', $calculation->calculateFormula('=FOURTHPOWER("X")'));
         self::assertSame('#NAME?', $calculation->calculateFormula('=FOURTHPOWE("X")'));