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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 |
---|---|
405 | * object type (comment, post, term, or user). |
406 | * |
407 | * @since 3.1.0 |
408 | * |
409 | * @param array $meta_ids An array of metadata entry IDs to delete. |
410 | * @param int $object_id Object ID. |
411 | * @param string $meta_key Meta key. |
412 | * @param mixed $_meta_value Meta value. |
413 | */ |
414 | do_action( "delete_{$meta_type}_meta", $meta_ids, $object_id, $meta_key, $_meta_value ); |
415 |
|
416 | // Old-style action. |
417 | if ( 'post' == $meta_type ) { |
418 | /** |
419 | * Fires immediately before deleting metadata for a post. |
420 | * |
421 | * @since 2.9.0 |
422 | * |
423 | * @param array $meta_ids An array of post metadata entry IDs to delete. |
Line | Code |
809 | if ( null !== $check ) { |
810 | return (bool) $check; |
811 | } |
812 |
|
813 | // Fetch the meta and go on if it's found. |
814 | if ( $meta = get_metadata_by_mid( $meta_type, $meta_id ) ) { |
815 | $object_id = (int) $meta->{$column}; |
816 |
|
817 | /** This action is documented in wp-includes/meta.php */ |
818 | do_action( "delete_{$meta_type}_meta", (array) $meta_id, $object_id, $meta->meta_key, $meta->meta_value ); |
819 |
|
820 | // Old-style action. |
821 | if ( 'post' == $meta_type || 'comment' == $meta_type ) { |
822 | /** |
823 | * Fires immediately before deleting post or comment metadata of a specific type. |
824 | * |
825 | * The dynamic portion of the hook, `$meta_type`, refers to the meta |
826 | * object type (post or comment). |
827 | * |