Xlsx Reader Shared Formula with Boolean Results

A solution, at least in part, for issue PHPOffice#4280. Xlsx Reader is not handling shared formulae correctly. As a result, some cells are treated as if they contain boolean values rather than formulae.

Author: oleibman

src/PhpSpreadsheet/Reader/Xlsx.php

@@ -854,6 +854,8 @@ protected function loadSpreadsheetFromFile(string $filename): Spreadsheet
                                         }
 
                                         // Read cell!
+                                        $useFormula = isset($c->f)
+                                            && ((string) $c->f !== '' || (isset($c->f->attributes()['t']) && strtolower((string) $c->f->attributes()['t']) === 'shared'));
                                         switch ($cellDataType) {
                                             case DataType::TYPE_STRING:
                                                 if ((string) $c->v != '') {
@@ -868,7 +870,7 @@ protected function loadSpreadsheetFromFile(string $filename): Spreadsheet
 
                                                 break;
                                             case DataType::TYPE_BOOL:
-                                                if (!isset($c->f) || ((string) $c->f) === '') {
+                                                if (!$useFormula) {
                                                     if (isset($c->v)) {
                                                         $value = self::castToBoolean($c);
                                                     } else {
@@ -883,16 +885,16 @@ protected function loadSpreadsheetFromFile(string $filename): Spreadsheet
 
                                                 break;
                                             case DataType::TYPE_STRING2:
-                                                if (isset($c->f)) {
+                                                if ($useFormula) {
                                                     $this->castToFormula($c, $r, $cellDataType, $value, $calculatedValue, 'castToString');
                                                     self::storeFormulaAttributes($c->f, $docSheet, $r);
                                                 } else {
-                                                     $value = self::castToString($c);
+                                                    $value = self::castToString($c);
                                                 }
 
                                                 break;
                                             case DataType::TYPE_INLINE:
-                                                if (isset($c->f)) {
+                                                if ($useFormula) {
                                                     $this->castToFormula($c, $r, $cellDataType, $value, $calculatedValue, 'castToError');
                                                     self::storeFormulaAttributes($c->f, $docSheet, $r);
                                                 } else {
@@ -901,7 +903,7 @@ protected function loadSpreadsheetFromFile(string $filename): Spreadsheet
 
                                                 break;
                                             case DataType::TYPE_ERROR:
-                                                if (!isset($c->f)) {
+                                                if (!$useFormula) {
                                                     $value = self::castToError($c);
                                                 } else {
                                                     // Formula
@@ -916,7 +918,7 @@ protected function loadSpreadsheetFromFile(string $filename): Spreadsheet
 
                                                 break;
                                             default:
-                                                if (!isset($c->f)) {
+                                                if (!$useFormula) {
                                                     $value = self::castToString($c);
                                                     if (is_numeric($value)) {
                                                         $value += 0;

tests/PhpSpreadsheetTests/Reader/Xlsx/SharedFormulaeTest.php

@@ -0,0 +1,37 @@
+<?php
+
+declare(strict_types=1);
+
+namespace PhpOffice\PhpSpreadsheetTests\Reader\Xlsx;
+
+use PhpOffice\PhpSpreadsheet\IOFactory;
+use PHPUnit\Framework\TestCase;
+
+class SharedFormulaeTest extends TestCase
+{
+    public function testSharedFormulae(): void
+    {
+        // Boolean functions were not handled correctly.
+        $filename = 'tests/data/Reader/XLSX/sharedformulae.xlsx';
+        $reader = IOFactory::createReader('Xlsx');
+        $spreadsheet = $reader->load($filename);
+        $sheet = $spreadsheet->getActiveSheet();
+        $expected = [
+            [1, '=A1+1', '=A1>3', '="x"&A1'],
+            [2, '=A2+1', '=A2>3', '="x"&A2'],
+            [3, '=A3+1', '=A3>3', '="x"&A3'],
+            [4, '=A4+1', '=A4>3', '="x"&A4'],
+            [5, '=A5+1', '=A5>3', '="x"&A5'],
+        ];
+        self::assertSame($expected, $sheet->toArray(null, false, false));
+        $expected = [
+            [1, 2, false, 'x1'],
+            [2, 3, false, 'x2'],
+            [3, 4, false, 'x3'],
+            [4, 5, true, 'x4'],
+            [5, 6, true, 'x5'],
+        ];
+        self::assertSame($expected, $sheet->toArray(null, true, false));
+        $spreadsheet->disconnectWorksheets();
+    }
+}