How to loop a tree array with unknown depth and get array blocks?

php multidimensional-array tree

PHP Snippet 1:

function saveAllValues($arr) {
    save_to_db($arr['id'], $arr['name'], $arr['is_master'], $arr['master_id']);
    if ($arr['has_children']) {
        array_map('saveAllValues, $arr['nodes']);
    }
}