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(']]>', ']]>', $excerpt);
$excerpt = wp_html_excerpt($excerpt, 252, '…');
/** 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/