public function getFlexFormValue(
        $T3FlexForm_array,
        $fieldName,
        $sheet = 'sDEF',
        $language = 'lDEF',
        $value = 'vDEF'
    ) {
        $sheetArray = is_array($T3FlexForm_array) ? $T3FlexForm_array['data'][$sheet][$language] : '';
        if (is_array($sheetArray)) {
            return $this->getFlexFormValueFromSheetArray($sheetArray, explode('/', $fieldName), $value);
        }
        return '';
    }