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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 |
|---|---|
| 2018 | // Use wp_delete_post (via wp_delete_post_revision) again. Ensures any meta/misplaced data gets cleaned up. |
| 2019 | foreach ( $revision_ids as $revision_id ) |
| 2020 | wp_delete_post_revision( $revision_id ); |
| 2021 | |
| 2022 | // Point all attachments to this post up one level |
| 2023 | $wpdb->update( $wpdb->posts, $parent_data, $parent_where + array( 'post_type' => 'attachment' ) ); |
| 2024 | |
| 2025 | $comment_ids = $wpdb->get_col( $wpdb->prepare( "SELECT comment_ID FROM $wpdb->comments WHERE comment_post_ID = %d", $postid )); |
| 2026 | if ( ! empty($comment_ids) ) { |
| 2027 | do_action( 'delete_comment', $comment_ids ); |
| 2028 | foreach ( $comment_ids as $comment_id ) |
| 2029 | wp_delete_comment( $comment_id, true ); |
| 2030 | do_action( 'deleted_comment', $comment_ids ); |
| 2031 | } |
| 2032 | |
| 2033 | $post_meta_ids = $wpdb->get_col( $wpdb->prepare( "SELECT meta_id FROM $wpdb->postmeta WHERE post_id = %d ", $postid )); |
| 2034 | if ( !empty($post_meta_ids) ) { |
| 2035 | do_action( 'delete_postmeta', $post_meta_ids ); |
| 2036 | $in_post_meta_ids = "'" . implode("', '", $post_meta_ids) . "'"; |
| Line | Code |
| 3785 | do_action('delete_attachment', $post_id); |
| 3786 | |
| 3787 | wp_delete_object_term_relationships($post_id, array('category', 'post_tag')); |
| 3788 | wp_delete_object_term_relationships($post_id, get_object_taxonomies($post->post_type)); |
| 3789 | |
| 3790 | $wpdb->query( $wpdb->prepare( "DELETE FROM $wpdb->postmeta WHERE meta_key = '_thumbnail_id' AND meta_value = %d", $post_id )); |
| 3791 | |
| 3792 | $comment_ids = $wpdb->get_col( $wpdb->prepare( "SELECT comment_ID FROM $wpdb->comments WHERE comment_post_ID = %d", $post_id )); |
| 3793 | if ( ! empty( $comment_ids ) ) { |
| 3794 | do_action( 'delete_comment', $comment_ids ); |
| 3795 | foreach ( $comment_ids as $comment_id ) |
| 3796 | wp_delete_comment( $comment_id, true ); |
| 3797 | do_action( 'deleted_comment', $comment_ids ); |
| 3798 | } |
| 3799 | |
| 3800 | $post_meta_ids = $wpdb->get_col( $wpdb->prepare( "SELECT meta_id FROM $wpdb->postmeta WHERE post_id = %d ", $post_id )); |
| 3801 | if ( !empty($post_meta_ids) ) { |
| 3802 | do_action( 'delete_postmeta', $post_meta_ids ); |
| 3803 | $in_post_meta_ids = "'" . implode("', '", $post_meta_ids) . "'"; |