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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 |
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373 | * object type (comment, post, or user). |
374 | * |
375 | * @since 3.1.0 |
376 | * |
377 | * @param array $meta_ids An array of metadata entry IDs to delete. |
378 | * @param int $object_id Object ID. |
379 | * @param string $meta_key Meta key. |
380 | * @param mixed $meta_value Meta value. |
381 | */ |
382 | do_action( "delete_{$meta_type}_meta", $meta_ids, $object_id, $meta_key, $_meta_value ); |
383 |
|
384 | // Old-style action. |
385 | if ( 'post' == $meta_type ) { |
386 | /** |
387 | * Fires immediately before deleting metadata for a post. |
388 | * |
389 | * @since 2.9.0 |
390 | * |
391 | * @param array $meta_ids An array of post metadata entry IDs to delete. |
Line | Code |
707 | // object and id columns |
708 | $column = sanitize_key($meta_type . '_id'); |
709 | $id_column = 'user' == $meta_type ? 'umeta_id' : 'meta_id'; |
710 |
|
711 | // Fetch the meta and go on if it's found. |
712 | if ( $meta = get_metadata_by_mid( $meta_type, $meta_id ) ) { |
713 | $object_id = $meta->{$column}; |
714 |
|
715 | /** This action is documented in wp-includes/meta.php */ |
716 | do_action( "delete_{$meta_type}_meta", (array) $meta_id, $object_id, $meta->meta_key, $meta->meta_value ); |
717 |
|
718 | // Old-style action. |
719 | if ( 'post' == $meta_type || 'comment' == $meta_type ) { |
720 | /** |
721 | * Fires immediately before deleting post or comment metadata of a specific type. |
722 | * |
723 | * The dynamic portion of the hook, `$meta_type`, refers to the meta |
724 | * object type (post or comment). |
725 | * |