/** * UPPERCASE * * Converts a string value to upper case. * * @param string $mixedCaseString * @return string */ public static function UPPERCASE($mixedCaseString) { $mixedCaseString = Functions::flattenSingleValue($mixedCaseString); if (is_bool($mixedCaseString)) { $mixedCaseString = $mixedCaseString ? \PHPExcel\Calculation::getTRUE() : \PHPExcel\Calculation::getFALSE(); } return \PHPExcel\Shared\StringHelper::strToUpper($mixedCaseString); }