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The best way to understand what a hook does is to look at where it occurs in the source code.
do_action( "hook_name" )apply_filters( "hook_name", "what_to_filter" ).Remember, this hook may occur in more than one file. Moreover, the hook's context may change from version to version.
This hook occurs 2 times in this file.
| Line | Code |
|---|---|
| 1522 | * @since 2.1.0 |
| 1523 | * @uses $wpdb |
| 1524 | */ |
| 1525 | function do_all_pings() { |
| 1526 | global $wpdb; |
| 1527 | |
| 1528 | // Do pingbacks |
| 1529 | while ($ping = $wpdb->get_row("SELECT * FROM {$wpdb->posts}, {$wpdb->postmeta} WHERE {$wpdb->posts}.ID = {$wpdb->postmeta}.post_id AND {$wpdb->postmeta}.meta_key = '_pingme' LIMIT 1")) { |
| 1530 | $mid = $wpdb->get_var( "SELECT meta_id FROM {$wpdb->postmeta} WHERE post_id = {$ping->ID} AND meta_key = '_pingme' LIMIT 1"); |
| 1531 | do_action( 'delete_postmeta', $mid ); |
| 1532 | $wpdb->query( $wpdb->prepare( "DELETE FROM {$wpdb->postmeta} WHERE meta_id = %d", $mid ) ); |
| 1533 | do_action( 'deleted_postmeta', $mid ); |
| 1534 | pingback($ping->post_content, $ping->ID); |
| 1535 | } |
| 1536 | |
| 1537 | // Do Enclosures |
| 1538 | while ($enclosure = $wpdb->get_row("SELECT * FROM {$wpdb->posts}, {$wpdb->postmeta} WHERE {$wpdb->posts}.ID = {$wpdb->postmeta}.post_id AND {$wpdb->postmeta}.meta_key = '_encloseme' LIMIT 1")) { |
| 1539 | $mid = $wpdb->get_var( $wpdb->prepare("SELECT meta_id FROM {$wpdb->postmeta} WHERE post_id = %d AND meta_key = '_encloseme'", $enclosure->ID) ); |
| 1540 | do_action( 'delete_postmeta', $mid ); |
| 1541 | $wpdb->query( $wpdb->prepare("DELETE FROM {$wpdb->postmeta} WHERE meta_id = %d", $mid) ); |
| 1542 | do_action( 'deleted_postmeta', $mid ); |
| 1543 | do_enclose($enclosure->post_content, $enclosure->ID); |
| 1544 | } |
| 1545 | |
| 1546 | // Do Trackbacks |
| 1547 | $trackbacks = $wpdb->get_col("SELECT ID FROM $wpdb->posts WHERE to_ping <> '' AND post_status = 'publish'"); |
| 1548 | if ( is_array($trackbacks) ) |
| 1549 | foreach ( $trackbacks as $trackback ) |