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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.
| Line | Code |
|---|---|
| 4646 | delete_transient( 'dirsize_cache' ); |
| 4647 | |
| 4648 | /** |
| 4649 | * Fires before an attachment is deleted, at the start of wp_delete_attachment(). |
| 4650 | * |
| 4651 | * @since 2.0.0 |
| 4652 | * |
| 4653 | * @param int $post_id Attachment ID. |
| 4654 | */ |
| 4655 | do_action( 'delete_attachment', $post_id ); |
| 4656 | |
| 4657 | wp_delete_object_term_relationships($post_id, array('category', 'post_tag')); |
| 4658 | wp_delete_object_term_relationships($post_id, get_object_taxonomies($post->post_type)); |
| 4659 | |
| 4660 | delete_metadata( 'post', null, '_thumbnail_id', $post_id, true ); // delete all for any posts. |
| 4661 | |
| 4662 | $comment_ids = $wpdb->get_col( $wpdb->prepare( "SELECT comment_ID FROM $wpdb->comments WHERE comment_post_ID = %d", $post_id )); |
| 4663 | foreach ( $comment_ids as $comment_id ) |
| 4664 | wp_delete_comment( $comment_id, true ); |