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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 |
|---|---|
| 386 | * object type (comment, post, or user). |
| 387 | * |
| 388 | * @since 2.9.0 |
| 389 | * |
| 390 | * @param array $meta_ids An array of deleted metadata entry IDs. |
| 391 | * @param int $object_id Object ID. |
| 392 | * @param string $meta_key Meta key. |
| 393 | * @param mixed $meta_value Meta value. |
| 394 | */ |
| 395 | do_action( "deleted_{$meta_type}_meta", $meta_ids, $object_id, $meta_key, $_meta_value ); |
| 396 | |
| 397 | // Old-style action. |
| 398 | if ( 'post' == $meta_type ) { |
| 399 | /** |
| 400 | * Fires immediately after deleting metadata for a post. |
| 401 | * |
| 402 | * @since 2.9.0 |
| 403 | * |
| 404 | * @param array $meta_ids An array of deleted post metadata entry IDs. |
| Line | Code |
| 687 | } |
| 688 | |
| 689 | // Run the query, will return true if deleted, false otherwise |
| 690 | $result = (bool) $wpdb->delete( $table, array( $id_column => $meta_id ) ); |
| 691 | |
| 692 | // Clear the caches. |
| 693 | wp_cache_delete($object_id, $meta_type . '_meta'); |
| 694 | |
| 695 | /** This action is documented in wp-includes/meta.php */ |
| 696 | do_action( "deleted_{$meta_type}_meta", (array) $meta_id, $object_id, $meta->meta_key, $meta->meta_value ); |
| 697 | |
| 698 | // Old-style action. |
| 699 | if ( 'post' == $meta_type || 'comment' == $meta_type ) { |
| 700 | /** |
| 701 | * Fires immediately after deleting post or comment metadata of a specific type. |
| 702 | * |
| 703 | * The dynamic portion of the hook, $meta_type, refers to the meta |
| 704 | * object type (post or comment). |
| 705 | * |