wp-includes/nav-menu.php:676Determines whether a menu item is valid.
$itemobjectboolfunction _is_valid_nav_menu_item( $item ) { return empty( $item->_invalid );}Introduced in 3.2.0. Unchanged from 6.7.7 through 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
src/wp-includes/nav-menu.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.