title: \Zend_Controller_Front::getInstance() - similar controller in symfony
body: <p>I have a question connected with Symfony. I need to get request, but I don't want just by global variable $_REQUEST. I know, that in Zend is something like Zend_Controller_Front and I can get instance, but I don't know how I can do the same in Symfony. Any ideas? 
  Thx. </p>