code: public function unserialize($serialized)
  	{
  		$data = unserialize($serialized, array('allowed_classes'=>false));
  
  		if (array_keys($data) != array('id', 'username', 'password', 'admin', 'disable', 'start', 'stop'))
  		{
  			return;
  		}
  
  		list($this->id, $this->username, $this->password, $this->admin, $this->disable, $this->start, $this->stop) = array_values($data);
  	}
docs: {@inheritdoc}