执行引用。

原型

do_trackbacks( int|WP_Post $post_id )

参数

$post_id (int|WP_Post) (Required) 发布对象或ID以进行引用。

源文件

路径:wp-includes/comment.php

<?php
...
function do_trackbacks( $post_id ) {
	global $wpdb;
	$post = get_post( $post_id );
	if ( ! $post ) {
		return false;
	}
	$to_ping = get_to_ping( $post );
	$pinged  = get_pung( $post );
	if ( empty( $to_ping ) ) {
		$wpdb->update($wpdb->posts, array( 'to_ping' => '' ), array( 'ID' => $post->ID ) );
		return;
	}
	if ( empty($post->post_excerpt) ) {
		/** This filter is documented in wp-includes/post-template.php */
		$excerpt = apply_filters( 'the_content', $post->post_content, $post->ID );
	} else {
		/** This filter is documented in wp-includes/post-template.php */
		$excerpt = apply_filters( 'the_excerpt', $post->post_excerpt );
	}
	$excerpt = str_replace(']]>', ']]&gt;', $excerpt);
	$excerpt = wp_html_excerpt($excerpt, 252, '&#8230;');
	/** This filter is documented in wp-includes/post-template.php */
	$post_title = apply_filters( 'the_title', $post->post_title, $post->ID );
	$post_title = strip_tags($post_title);
	if ( $to_ping ) {
		foreach ( (array) $to_ping as $tb_ping ) {
			$tb_ping = trim($tb_ping);
			if ( !in_array($tb_ping, $pinged) ) {
				trackback( $tb_ping, $post_title, $excerpt, $post->ID );
				$pinged[] = $tb_ping;
			} else {
				$wpdb->query( $wpdb->prepare( "UPDATE $wpdb->posts SET to_ping = TRIM(REPLACE(to_ping, %s,
					'')) WHERE ID = %d", $tb_ping, $post->ID ) );
			}
		}
	}
}
...
?>

其他

英文文档:https://developer.wordpress.org/reference/functions/do_trackbacks/