add_(meta_type)_metadata хук-фильтр . WP 3.1.0

Short-circuits adding metadata of a specific type.

The dynamic portion of the hook, $meta_type, refers to the meta object type (post, comment, term, user, or any other type with an associated meta table). Returning a non-null value will effectively short-circuit the function.

Использование

add_filter( 'add_(meta_type)_metadata', 'filter_function_name_9439', 10, 5 );
function filter_function_name_9439( $check, $object_id, $meta_key, $meta_value, $unique ){
	// filter...

	return $check;
}

$check(null/true/false)

Whether to allow adding metadata for the given type.

$object_id(число)

ID of the object metadata is for.

$meta_key(строка)

Metadata key.

$meta_value(смешанный)

Metadata value. Must be serializable if non-scalar.

$unique(true/false)

Whether the specified meta key should be unique for the object.

Список изменений

Где вызывается хук

$check = apply_filters( "add_{$meta_type}_metadata", null, $object_id, $meta_key, $meta_value, $unique );

Где используется хук в ядре WordPress

add_filter( 'add_term_metadata', 'wp_check_term_meta_support_prefilter' );

add_filter( 'add_blog_metadata', 'wp_check_site_meta_support_prefilter' );