if (!in_array($rating, array('0', '1', '2', '3', '4', '5'))) {
            /* HINT: Requested object string/id/type ("album", "myusername", "some song title", 1298376) */
            Api5::error(sprintf(T_('Bad Request: %s'), $rating), ErrorCodeEnum::BAD_REQUEST, self::ACTION, 'rating', $input['api_format']);

            return false;