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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 |
|---|---|
| 411 | * (post, comment, term, user, or any other type with an associated meta table). |
| 412 | * |
| 413 | * @since 3.1.0 |
| 414 | * |
| 415 | * @param string[] $meta_ids An array of metadata entry IDs to delete. |
| 416 | * @param int $object_id ID of the object metadata is for. |
| 417 | * @param string $meta_key Metadata key. |
| 418 | * @param mixed $_meta_value Metadata value. Serialized if non-scalar. |
| 419 | */ |
| 420 | do_action( "delete_{$meta_type}_meta", $meta_ids, $object_id, $meta_key, $_meta_value ); |
| 421 | |
| 422 | // Old-style action. |
| 423 | if ( 'post' === $meta_type ) { |
| 424 | /** |
| 425 | * Fires immediately before deleting metadata for a post. |
| 426 | * |
| 427 | * @since 2.9.0 |
| 428 | * |
| 429 | * @param string[] $meta_ids An array of metadata entry IDs to delete. |
| Line | Code |
| 932 | return (bool) $check; |
| 933 | } |
| 934 | |
| 935 | // Fetch the meta and go on if it's found. |
| 936 | $meta = get_metadata_by_mid( $meta_type, $meta_id ); |
| 937 | if ( $meta ) { |
| 938 | $object_id = (int) $meta->{$column}; |
| 939 | |
| 940 | /** This action is documented in wp-includes/meta.php */ |
| 941 | do_action( "delete_{$meta_type}_meta", (array) $meta_id, $object_id, $meta->meta_key, $meta->meta_value ); |
| 942 | |
| 943 | // Old-style action. |
| 944 | if ( 'post' === $meta_type || 'comment' === $meta_type ) { |
| 945 | /** |
| 946 | * Fires immediately before deleting post or comment metadata of a specific type. |
| 947 | * |
| 948 | * The dynamic portion of the hook, `$meta_type`, refers to the meta |
| 949 | * object type (post or comment). |
| 950 | * |