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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 |
|---|---|
| 446 | * object type (comment, post, term, or user). |
| 447 | * |
| 448 | * @since 2.9.0 |
| 449 | * |
| 450 | * @param array $meta_ids An array of deleted metadata entry IDs. |
| 451 | * @param int $object_id Object ID. |
| 452 | * @param string $meta_key Meta key. |
| 453 | * @param mixed $meta_value Meta value. |
| 454 | */ |
| 455 | do_action( "deleted_{$meta_type}_meta", $meta_ids, $object_id, $meta_key, $_meta_value ); |
| 456 | |
| 457 | // Old-style action. |
| 458 | if ( 'post' == $meta_type ) { |
| 459 | /** |
| 460 | * Fires immediately after deleting metadata for a post. |
| 461 | * |
| 462 | * @since 2.9.0 |
| 463 | * |
| 464 | * @param array $meta_ids An array of deleted post metadata entry IDs. |
| Line | Code |
| 831 | } |
| 832 | |
| 833 | // Run the query, will return true if deleted, false otherwise |
| 834 | $result = (bool) $wpdb->delete( $table, array( $id_column => $meta_id ) ); |
| 835 | |
| 836 | // Clear the caches. |
| 837 | wp_cache_delete( $object_id, $meta_type . '_meta' ); |
| 838 | |
| 839 | /** This action is documented in wp-includes/meta.php */ |
| 840 | do_action( "deleted_{$meta_type}_meta", (array) $meta_id, $object_id, $meta->meta_key, $meta->meta_value ); |
| 841 | |
| 842 | // Old-style action. |
| 843 | if ( 'post' == $meta_type || 'comment' == $meta_type ) { |
| 844 | /** |
| 845 | * Fires immediately after deleting post or comment metadata of a specific type. |
| 846 | * |
| 847 | * The dynamic portion of the hook, `$meta_type`, refers to the meta |
| 848 | * object type (post or comment). |
| 849 | * |