session.php

<?php

class XSession extends Phalcon\Session\Adapter implements
  Phalcon\Session\AdapterInterface,
	Phalcon\DI\InjectionAwareInterface
{

	protected $_dependencyInjector;

	public function setDI($di)
	{
		$this->_dependencyInjector = $di;
	}

	public function getDI()
	{
		return $this->_dependencyInjector;
	}

	public function x()
	{
		$cookies = $this->getDI()->get('cookies');
		$cookie = $cookies->get('cookie_name');
		var_dump($cookie->getValue());
	}

}


$di = new Phalcon\DI\FactoryDefault();

$di->set('session', function() {
	return new XSession();
});

$session = $di['session'];
echo $session->x();