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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 |
|---|---|
| 376 | * object type (comment, post, or user). |
| 377 | * |
| 378 | * @since 3.1.0 |
| 379 | * |
| 380 | * @param array $meta_ids An array of metadata entry IDs to delete. |
| 381 | * @param int $object_id Object ID. |
| 382 | * @param string $meta_key Meta key. |
| 383 | * @param mixed $meta_value Meta value. |
| 384 | */ |
| 385 | do_action( "delete_{$meta_type}_meta", $meta_ids, $object_id, $meta_key, $_meta_value ); |
| 386 | |
| 387 | // Old-style action. |
| 388 | if ( 'post' == $meta_type ) { |
| 389 | /** |
| 390 | * Fires immediately before deleting metadata for a post. |
| 391 | * |
| 392 | * @since 2.9.0 |
| 393 | * |
| 394 | * @param array $meta_ids An array of post metadata entry IDs to delete. |
| Line | Code |
| 716 | // object and id columns |
| 717 | $column = sanitize_key($meta_type . '_id'); |
| 718 | $id_column = 'user' == $meta_type ? 'umeta_id' : 'meta_id'; |
| 719 | |
| 720 | // Fetch the meta and go on if it's found. |
| 721 | if ( $meta = get_metadata_by_mid( $meta_type, $meta_id ) ) { |
| 722 | $object_id = $meta->{$column}; |
| 723 | |
| 724 | /** This action is documented in wp-includes/meta.php */ |
| 725 | do_action( "delete_{$meta_type}_meta", (array) $meta_id, $object_id, $meta->meta_key, $meta->meta_value ); |
| 726 | |
| 727 | // Old-style action. |
| 728 | if ( 'post' == $meta_type || 'comment' == $meta_type ) { |
| 729 | /** |
| 730 | * Fires immediately before deleting post or comment metadata of a specific type. |
| 731 | * |
| 732 | * The dynamic portion of the hook, `$meta_type`, refers to the meta |
| 733 | * object type (post or comment). |
| 734 | * |