How not to use func_get_args()

  public function __construct()
  {
      $args = func_get_args();
      if (empty($args[0])) {
          $args[0] = array();
      }
      $this->_data = $args[0];
      $this->_construct();
  }

instead, do...

  public function __construct($data = array())
  {
      $this->_data = $data;
      $this->_construct();
  }