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lib/PhpSpreadsheet/Calculation/LookupRef/Formula.php

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+<?php
+
+namespace PhpOffice\PhpSpreadsheet\Calculation\LookupRef;
+
+use PhpOffice\PhpSpreadsheet\Calculation\Calculation;
+use PhpOffice\PhpSpreadsheet\Calculation\Information\ExcelError;
+use PhpOffice\PhpSpreadsheet\Cell\Cell;
+
+class Formula
+{
+    /**
+     * FORMULATEXT.
+     *
+     * @param mixed $cellReference The cell to check
+     * @param ?Cell $cell The current cell (containing this formula)
+     */
+    public static function text(mixed $cellReference = '', ?Cell $cell = null): string
+    {
+        if ($cell === null) {
+            return ExcelError::REF();
+        }
+
+        preg_match('/^' . Calculation::CALCULATION_REGEXP_CELLREF . '$/i', $cellReference, $matches);
+
+        $cellReference = $matches[6] . $matches[7];
+        $worksheetName = trim($matches[3], "'");
+        $worksheet = (!empty($worksheetName))
+            ? $cell->getWorksheet()->getParentOrThrow()->getSheetByName($worksheetName)
+            : $cell->getWorksheet();
+
+        if (
+            $worksheet === null
+            || !$worksheet->cellExists($cellReference)
+            || !$worksheet->getCell($cellReference)->isFormula()
+        ) {
+            return ExcelError::NA();
+        }
+
+        return $worksheet->getCell($cellReference)->getValue();
+    }
+}