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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 |
|---|---|
| 674 | function delete_meta( $mid ) { |
| 675 | global $wpdb; |
| 676 | $mid = (int) $mid; |
| 677 | |
| 678 | $post_id = $wpdb->get_var( $wpdb->prepare("SELECT post_id FROM $wpdb->postmeta WHERE meta_id = %d", $mid) ); |
| 679 | |
| 680 | do_action( 'delete_postmeta', $mid ); |
| 681 | wp_cache_delete($post_id, 'post_meta'); |
| 682 | $rval = $wpdb->query( $wpdb->prepare("DELETE FROM $wpdb->postmeta WHERE meta_id = %d", $mid) ); |
| 683 | do_action( 'deleted_postmeta', $mid ); |
| 684 | |
| 685 | return $rval; |
| 686 | } |
| 687 | |
| 688 | /** |
| 689 | * Get a list of previously defined keys. |
| 690 | * |
| 691 | * @since 1.2.0 |
| 692 | * |