限定wordpress 只搜索文章标题（wordpress搜索在哪里）

/**lIF快乐收录网

 * 限定wordpress 只搜索文章标题lIF快乐收录网

 * https://www.xuewangzhan.net/wpbbs/15904.htmllIF快乐收录网

 */ function__search_by_title_only( $search, $wp_query ) {     global $wpdb;     if ( empty( $search ) )         return $search; // skip processing - no search term in query     $q = $wp_query->query_vars;     $n = ! empty( $q[exact] ) ? : %;     $search =     $searchand = ;     foreach ( (array) $q[search_terms] as $term ) {        $term = esc_sql( like_escape( $term ) );        $search .= "{$searchand}($wpdb->posts.post_title LIKE{$n}{$term}{$n})";        $searchand = AND ;     }     if ( ! empty( $search ) ) {        $search = " AND ({$search}) ";        if ( !is_user_logged_in() )            $search .= " AND ($wpdb->posts.post_password = ) ";     }     return $search; } add_filter( posts_search, __search_by_title_only, 500, 2 );