WordPress at a glance
action is not described

add_(meta_type)_meta action-hook . WP 3.1.0

Fires immediately before meta of a specific type is added.

The dynamic portion of the hook, $meta_type, refers to the meta object type (comment, post, term, or user).


add_action( 'add_(meta_type)_meta', 'action_function_name_8148', 10, 3 );
function action_function_name_8148( $object_id, $meta_key, $_meta_value ){
	// action...
Object ID.
Meta key.
Meta value.

Where the hook is called

wp-includes/meta.php 102
do_action( "add_{$meta_type}_meta", $object_id, $meta_key, $_meta_value );

Where the hook is used (in WP core)

Использование не найдено.