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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 |
|---|---|
| 420 | * object type (comment, post, or user). |
| 421 | * |
| 422 | * @since 2.9.0 |
| 423 | * |
| 424 | * @param array $meta_ids An array of deleted metadata entry IDs. |
| 425 | * @param int $object_id Object ID. |
| 426 | * @param string $meta_key Meta key. |
| 427 | * @param mixed $meta_value Meta value. |
| 428 | */ |
| 429 | do_action( "deleted_{$meta_type}_meta", $meta_ids, $object_id, $meta_key, $_meta_value ); |
| 430 | |
| 431 | // Old-style action. |
| 432 | if ( 'post' == $meta_type ) { |
| 433 | /** |
| 434 | * Fires immediately after deleting metadata for a post. |
| 435 | * |
| 436 | * @since 2.9.0 |
| 437 | * |
| 438 | * @param array $meta_ids An array of deleted post metadata entry IDs. |
| Line | Code |
| 742 | } |
| 743 | |
| 744 | // Run the query, will return true if deleted, false otherwise |
| 745 | $result = (bool) $wpdb->delete( $table, array( $id_column => $meta_id ) ); |
| 746 | |
| 747 | // Clear the caches. |
| 748 | wp_cache_delete($object_id, $meta_type . '_meta'); |
| 749 | |
| 750 | /** This action is documented in wp-includes/meta.php */ |
| 751 | do_action( "deleted_{$meta_type}_meta", (array) $meta_id, $object_id, $meta->meta_key, $meta->meta_value ); |
| 752 | |
| 753 | // Old-style action. |
| 754 | if ( 'post' == $meta_type || 'comment' == $meta_type ) { |
| 755 | /** |
| 756 | * Fires immediately after deleting post or comment metadata of a specific type. |
| 757 | * |
| 758 | * The dynamic portion of the hook, `$meta_type`, refers to the meta |
| 759 | * object type (post or comment). |
| 760 | * |