public static function arrayChangeCaseValue($array, $case = CASE_LOWER)
    {
        $return = [];
        foreach ($array as $key => $value) {
            if (self::isReallyArray($value)) {
                $results = array_merge($results, self::arrayChangeCaseValue($value, $case));
            } else {
                $array[$key] = ($case == CASE_UPPER) ? strtoupper($array[$key]) : strtolower($array[$key]);
            }
        }

        return $array;
    }