_nav_menu_item_id_use_once() WordPress Function

The nav_menu_item_id_use_once() function is used to check if a given menu item ID is currently in use. This can be useful when you need to make sure that a given menu item is only used once.

_nav_menu_item_id_use_once( string $id, object $item ) #

function _nav_menu_item_id_use_once( $id, $item ) {
	static $_used_ids = array();

	if ( in_array( $item->ID, $_used_ids, true ) ) {
		return '';
	}

	$_used_ids[] = $item->ID;

	return $id;
}