public static function toString($data)
    {
        if (is_array($data)) {
            $newData = [];
            foreach ($data as $key => $val) {
                $key = (string)$key;
                $newData[$key] = static::toString($val);
            }
        } else {
            $newData = (string)$data;
        }

        return $newData;
    }