do_trackbacks( int|WP_Post $post_id )

Perform trackbacks.

Contents

Description Description

Parameters Parameters

$post_id

(int|WP_Post) (Required) Post object or ID to do trackbacks on.

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Source Source

File: wp-includes/comment.php

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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
                    )
                );
            }
        }
    }
}

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Changelog Changelog

Changelog
Version Description
4.7.0 $post_id can be a WP_Post object.
1.5.0 Introduced.

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Uses Uses

Uses
Uses Description
wp-includes/formatting.php: wp_html_excerpt()

Safely extracts not more than the first $count characters from html string.
wp-includes/plugin.php: apply_filters()

Call the functions added to a filter hook.
wp-includes/post-template.php: the_content

Filters the post content.
wp-includes/post-template.php: the_excerpt

Filters the displayed post excerpt.
wp-includes/post-template.php: the_title

Filters the post title.
wp-includes/post.php: get_to_ping()

Retrieve URLs that need to be pinged.
wp-includes/post.php: get_pung()

Retrieve URLs already pinged for a post.
wp-includes/post.php: get_post()

Retrieves post data given a post ID or post object.
wp-includes/wp-db.php: wpdb::update()

Update a row in the table
wp-includes/wp-db.php: wpdb::query()

Perform a MySQL database query, using current database connection.
wp-includes/wp-db.php: wpdb::prepare()

Prepares a SQL query for safe execution. Uses sprintf()-like syntax.
wp-includes/comment.php: trackback()

Send a Trackback.
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Used By Used By

Used By
Used By Description
wp-includes/comment.php: do_all_pings()

Perform all pingbacks, enclosures, trackbacks, and send to pingback services.

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