JBZoo\Utils\Arr::lastKey PHP Method

    public static function lastKey(array $array)
    {
        end($array);
        return key($array);
    }

 public function testLastKey()
 {
     $test = array('a' => array('a' => 'b', 'c' => 'd'));
     is('c', Arr::lastKey(Vars::get($test['a'])));
 }