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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 |
|---|---|
| 470 | * - `delete_user_meta` |
| 471 | * |
| 472 | * @since 3.1.0 |
| 473 | * |
| 474 | * @param string[] $meta_ids An array of metadata entry IDs to delete. |
| 475 | * @param int $object_id ID of the object metadata is for. |
| 476 | * @param string $meta_key Metadata key. |
| 477 | * @param mixed $_meta_value Metadata value. |
| 478 | */ |
| 479 | do_action( "delete_{$meta_type}_meta", $meta_ids, $object_id, $meta_key, $_meta_value ); |
| 480 | |
| 481 | // Old-style action. |
| 482 | if ( 'post' === $meta_type ) { |
| 483 | /** |
| 484 | * Fires immediately before deleting metadata for a post. |
| 485 | * |
| 486 | * @since 2.9.0 |
| 487 | * |
| 488 | * @param string[] $meta_ids An array of metadata entry IDs to delete. |
| Line | Code |
| 1027 | return (bool) $check; |
| 1028 | } |
| 1029 | |
| 1030 | // Fetch the meta and go on if it's found. |
| 1031 | $meta = get_metadata_by_mid( $meta_type, $meta_id ); |
| 1032 | if ( $meta ) { |
| 1033 | $object_id = (int) $meta->{$column}; |
| 1034 | |
| 1035 | /** This action is documented in wp-includes/meta.php */ |
| 1036 | do_action( "delete_{$meta_type}_meta", (array) $meta_id, $object_id, $meta->meta_key, $meta->meta_value ); |
| 1037 | |
| 1038 | // Old-style action. |
| 1039 | if ( 'post' === $meta_type || 'comment' === $meta_type ) { |
| 1040 | /** |
| 1041 | * Fires immediately before deleting post or comment metadata of a specific type. |
| 1042 | * |
| 1043 | * The dynamic portion of the hook name, `$meta_type`, refers to the meta |
| 1044 | * object type (post or comment). |
| 1045 | * |