public function __construct($arg1 = null, $arg2 = null)
 {
     parent::__construct();
     $this->validate($arg1, $arg2);
     $this->arg1 = $arg1;
     $this->arg2 = $arg2;
 }
 public function __construct($test = '')
 {
     $this->test = $test;
     parent::__construct();
 }