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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 |
|---|---|
| 401 | * object type (comment, post, or user). |
| 402 | * |
| 403 | * @since 2.9.0 |
| 404 | * |
| 405 | * @param array $meta_ids An array of deleted metadata entry IDs. |
| 406 | * @param int $object_id Object ID. |
| 407 | * @param string $meta_key Meta key. |
| 408 | * @param mixed $meta_value Meta value. |
| 409 | */ |
| 410 | do_action( "deleted_{$meta_type}_meta", $meta_ids, $object_id, $meta_key, $_meta_value ); |
| 411 | |
| 412 | // Old-style action. |
| 413 | if ( 'post' == $meta_type ) { |
| 414 | /** |
| 415 | * Fires immediately after deleting metadata for a post. |
| 416 | * |
| 417 | * @since 2.9.0 |
| 418 | * |
| 419 | * @param array $meta_ids An array of deleted post metadata entry IDs. |
| Line | Code |
| 722 | } |
| 723 | |
| 724 | // Run the query, will return true if deleted, false otherwise |
| 725 | $result = (bool) $wpdb->delete( $table, array( $id_column => $meta_id ) ); |
| 726 | |
| 727 | // Clear the caches. |
| 728 | wp_cache_delete($object_id, $meta_type . '_meta'); |
| 729 | |
| 730 | /** This action is documented in wp-includes/meta.php */ |
| 731 | do_action( "deleted_{$meta_type}_meta", (array) $meta_id, $object_id, $meta->meta_key, $meta->meta_value ); |
| 732 | |
| 733 | // Old-style action. |
| 734 | if ( 'post' == $meta_type || 'comment' == $meta_type ) { |
| 735 | /** |
| 736 | * Fires immediately after deleting post or comment metadata of a specific type. |
| 737 | * |
| 738 | * The dynamic portion of the hook, $meta_type, refers to the meta |
| 739 | * object type (post or comment). |
| 740 | * |