case 'favorite':
                    if ($operator_sql === 'NOT SOUNDS LIKE') {
                        $where[] = "NOT ((`artist`.`name` SOUNDS LIKE ? OR LTRIM(CONCAT(COALESCE(`artist`.`prefix`, ''), ' ', `artist`.`name`)) SOUNDS LIKE ?) AND `favorite_artist_" . $search_user_id . "`.`user` = " . $search_user_id . " AND `favorite_artist_" . $search_user_id . "`.`object_type` = 'artist')";
                    } else {
                        $where[] = "(`artist`.`name` $operator_sql ? OR LTRIM(CONCAT(COALESCE(`artist`.`prefix`, ''), ' ', `artist`.`name`)) $operator_sql ?) AND `favorite_artist_" . $search_user_id . "`.`user` = " . $search_user_id . " AND `favorite_artist_" . $search_user_id . "`.`object_type` = 'artist'";