Escape double quotes in a string value unless it's an empty string value

Author: MarkBaker

src/PhpSpreadsheet/Calculation/Functions.php

@@ -158,6 +158,10 @@ public static function ifCondition($condition)
             if (is_bool($condition)) {
                 return '=' . ($condition ? 'TRUE' : 'FALSE');
             } elseif (!is_numeric($condition)) {
+                if ($condition !== '""') { // Not an empty string
+                    // Escape any quotes in the string value
+                    $condition = preg_replace('/"/ui', '""', $condition);
+                }
                 $condition = Calculation::wrapResult(strtoupper($condition));
             }