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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 |
|---|---|
| 406 | * object type (comment, post, term, or user). |
| 407 | * |
| 408 | * @since 3.1.0 |
| 409 | * |
| 410 | * @param string[] $meta_ids An array of metadata entry IDs to delete. |
| 411 | * @param int $object_id ID of the object metadata is for. |
| 412 | * @param string $meta_key Metadata key. |
| 413 | * @param mixed $_meta_value Metadata value. Serialized if non-scalar. |
| 414 | */ |
| 415 | do_action( "delete_{$meta_type}_meta", $meta_ids, $object_id, $meta_key, $_meta_value ); |
| 416 | |
| 417 | // Old-style action. |
| 418 | if ( 'post' == $meta_type ) { |
| 419 | /** |
| 420 | * Fires immediately before deleting metadata for a post. |
| 421 | * |
| 422 | * @since 2.9.0 |
| 423 | * |
| 424 | * @param string[] $meta_ids An array of metadata entry IDs to delete. |
| Line | Code |
| 820 | return (bool) $check; |
| 821 | } |
| 822 | |
| 823 | // Fetch the meta and go on if it's found. |
| 824 | $meta = get_metadata_by_mid( $meta_type, $meta_id ); |
| 825 | if ( $meta ) { |
| 826 | $object_id = (int) $meta->{$column}; |
| 827 | |
| 828 | /** This action is documented in wp-includes/meta.php */ |
| 829 | do_action( "delete_{$meta_type}_meta", (array) $meta_id, $object_id, $meta->meta_key, $meta->meta_value ); |
| 830 | |
| 831 | // Old-style action. |
| 832 | if ( 'post' == $meta_type || 'comment' == $meta_type ) { |
| 833 | /** |
| 834 | * Fires immediately before deleting post or comment metadata of a specific type. |
| 835 | * |
| 836 | * The dynamic portion of the hook, `$meta_type`, refers to the meta |
| 837 | * object type (post or comment). |
| 838 | * |