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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 |
---|---|
378 | * object type (comment, post, or user). |
379 | * |
380 | * @since 3.1.0 |
381 | * |
382 | * @param array $meta_ids An array of metadata entry IDs to delete. |
383 | * @param int $object_id Object ID. |
384 | * @param string $meta_key Meta key. |
385 | * @param mixed $meta_value Meta value. |
386 | */ |
387 | do_action( "delete_{$meta_type}_meta", $meta_ids, $object_id, $meta_key, $_meta_value ); |
388 |
|
389 | // Old-style action. |
390 | if ( 'post' == $meta_type ) { |
391 | /** |
392 | * Fires immediately before deleting metadata for a post. |
393 | * |
394 | * @since 2.9.0 |
395 | * |
396 | * @param array $meta_ids An array of post metadata entry IDs to delete. |
Line | Code |
718 | // object and id columns |
719 | $column = sanitize_key($meta_type . '_id'); |
720 | $id_column = 'user' == $meta_type ? 'umeta_id' : 'meta_id'; |
721 |
|
722 | // Fetch the meta and go on if it's found. |
723 | if ( $meta = get_metadata_by_mid( $meta_type, $meta_id ) ) { |
724 | $object_id = $meta->{$column}; |
725 |
|
726 | /** This action is documented in wp-includes/meta.php */ |
727 | do_action( "delete_{$meta_type}_meta", (array) $meta_id, $object_id, $meta->meta_key, $meta->meta_value ); |
728 |
|
729 | // Old-style action. |
730 | if ( 'post' == $meta_type || 'comment' == $meta_type ) { |
731 | /** |
732 | * Fires immediately before deleting post or comment metadata of a specific type. |
733 | * |
734 | * The dynamic portion of the hook, `$meta_type`, refers to the meta |
735 | * object type (post or comment). |
736 | * |