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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 |
|---|---|
| 597 | function delete_meta( $mid ) { |
| 598 | global $wpdb; |
| 599 | $mid = (int) $mid; |
| 600 | |
| 601 | $post_id = $wpdb->get_var( $wpdb->prepare("SELECT post_id FROM $wpdb->postmeta WHERE meta_id = %d", $mid) ); |
| 602 | |
| 603 | do_action( 'delete_postmeta', $mid ); |
| 604 | wp_cache_delete($post_id, 'post_meta'); |
| 605 | $rval = $wpdb->query( $wpdb->prepare("DELETE FROM $wpdb->postmeta WHERE meta_id = %d", $mid) ); |
| 606 | do_action( 'deleted_postmeta', $mid ); |
| 607 | |
| 608 | return $rval; |
| 609 | } |
| 610 | |
| 611 | /** |
| 612 | * Get a list of previously defined keys. |
| 613 | * |
| 614 | * @since unknown |
| 615 | * |