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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 |
939 | return (bool) $check; |
940 | } |
941 |
|
942 | // Fetch the meta and go on if it's found. |
943 | $meta = get_metadata_by_mid( $meta_type, $meta_id ); |
944 | if ( $meta ) { |
945 | $object_id = (int) $meta->{$column}; |
946 |
|
947 | /** This action is documented in wp-includes/meta.php */ |
948 | do_action( "delete_{$meta_type}_meta", (array) $meta_id, $object_id, $meta->meta_key, $meta->meta_value ); |
949 |
|
950 | // Old-style action. |
951 | if ( 'post' === $meta_type || 'comment' === $meta_type ) { |
952 | /** |
953 | * Fires immediately before deleting post or comment metadata of a specific type. |
954 | * |
955 | * The dynamic portion of the hook, `$meta_type`, refers to the meta |
956 | * object type (post or comment). |
957 | * |