Flow\Helper::keys PHP Méthode

    public static function keys($obj = null)
    {
        if (is_array($obj)) {
            return array_keys($obj);
        } elseif ($obj instanceof \Traversable) {
            return array_keys(iterator_to_array($obj));
        }
        return null;
    }

 public function test_keys()
 {
     $hash = array('x' => 1, 'y' => 2);
     $this->assertEquals(array('x', 'y'), Helper::keys($hash));
 }