我想搜索由特定作者发布的帖子。为此，我在中添加了一个过滤器functions.php:

function wpse_29570_where_filter($where){
        global $wpdb;
        if( is_search() ) {
            $search= get_query_var(\'s\');
            $query=$wpdb->prepare("SELECT $wpdb->users.ID  FROM $wpdb->users WHERE  $wpdb->users.display_name LIKE \'%%%s%%\' ", $search );
            $authorID= $wpdb->get_var( $query );//die;

            if($authorID){
                $where = "  AND  ( atl_posts.post_author = {$authorID} ) ";
            }
            //echo $where;
         }
         return $where;
    }

    add_filter(\'posts_where\',\'wpse_29570_where_filter\');

AND ( atl_posts.post_author = 1 ) 

请帮我把它做好
有谁能告诉我更好的方法吗？