WordPress函数Single_post_title文章页输出文章标题

function single_post_title( $prefix = '', $display = true ) {     $_post = get_queried_object();     if ( !isset($_post->post_title) )         return;     /**      * Filters the page title for a single post.      *      * @since 0.71      *      * @param string $_post_title The single post page title.      * @param object $_post       The current queried object as returned by get_queried_object().      */     $title = apply_filters( 'single_post_title', $_post->post_title, $_post );     if ( $display )         echo $prefix . $title;     else         return $prefix . $title; }