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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 |
|---|---|
| 359 | * object type (comment, post, or user). |
| 360 | * |
| 361 | * @since 3.1.0 |
| 362 | * |
| 363 | * @param array $meta_ids An array of metadata entry IDs to delete. |
| 364 | * @param int $object_id Object ID. |
| 365 | * @param string $meta_key Meta key. |
| 366 | * @param mixed $meta_value Meta value. |
| 367 | */ |
| 368 | do_action( "delete_{$meta_type}_meta", $meta_ids, $object_id, $meta_key, $_meta_value ); |
| 369 | |
| 370 | // Old-style action. |
| 371 | if ( 'post' == $meta_type ) { |
| 372 | /** |
| 373 | * Fires immediately before deleting metadata for a post. |
| 374 | * |
| 375 | * @since 2.9.0 |
| 376 | * |
| 377 | * @param array $meta_ids An array of post metadata entry IDs to delete. |
| Line | Code |
| 698 | // object and id columns |
| 699 | $column = sanitize_key($meta_type . '_id'); |
| 700 | $id_column = 'user' == $meta_type ? 'umeta_id' : 'meta_id'; |
| 701 | |
| 702 | // Fetch the meta and go on if it's found. |
| 703 | if ( $meta = get_metadata_by_mid( $meta_type, $meta_id ) ) { |
| 704 | $object_id = $meta->{$column}; |
| 705 | |
| 706 | /** This action is documented in wp-includes/meta.php */ |
| 707 | do_action( "delete_{$meta_type}_meta", (array) $meta_id, $object_id, $meta->meta_key, $meta->meta_value ); |
| 708 | |
| 709 | // Old-style action. |
| 710 | if ( 'post' == $meta_type || 'comment' == $meta_type ) { |
| 711 | /** |
| 712 | * Fires immediately before deleting post or comment metadata of a specific type. |
| 713 | * |
| 714 | * The dynamic portion of the hook, $meta_type, refers to the meta |
| 715 | * object type (post or comment). |
| 716 | * |