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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 |
|---|---|
| 4900 | delete_transient( 'dirsize_cache' ); |
| 4901 | |
| 4902 | /** |
| 4903 | * Fires before an attachment is deleted, at the start of wp_delete_attachment(). |
| 4904 | * |
| 4905 | * @since 2.0.0 |
| 4906 | * |
| 4907 | * @param int $post_id Attachment ID. |
| 4908 | */ |
| 4909 | do_action( 'delete_attachment', $post_id ); |
| 4910 | |
| 4911 | wp_delete_object_term_relationships($post_id, array('category', 'post_tag')); |
| 4912 | wp_delete_object_term_relationships($post_id, get_object_taxonomies($post->post_type)); |
| 4913 | |
| 4914 | // Delete all for any posts. |
| 4915 | delete_metadata( 'post', null, '_thumbnail_id', $post_id, true ); |
| 4916 | |
| 4917 | $comment_ids = $wpdb->get_col( $wpdb->prepare( "SELECT comment_ID FROM $wpdb->comments WHERE comment_post_ID = %d", $post_id )); |
| 4918 | foreach ( $comment_ids as $comment_id ) |