Symfony_quick_tour_3.4

Getting Information from the Request
Sometimes your controllers need to access the information related to the user request, such as their
preferred language, IP address or the URL query parameters. To get access to this information, add a new
argument of type Request to the action. The name of this new argument doesn't matter, but it must be
preceded by the Request type in order to work (don't forget to add the new use statement that imports
this Request class):
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// src/AppBundle/Controller/DefaultController.php
namespace AppBundle\Controller;
use Symfony\Bundle\FrameworkBundle\Controller\Controller;
use Symfony\Component\HttpFoundation\Request;
use Symfony\Component\Routing\Annotation\Route;
class DefaultController extends Controller
{
/**
* @Route("/", name="homepage")
*/
public function indexAction(Request $request)
{
// is it an Ajax request?
$isAjax = $request->isXmlHttpRequest();
}
}
// what's the preferred language of the user?
$language = $request->getPreferredLanguage(array('en', 'fr'));
// get the value of a $_GET parameter
$pageName = $request->query->get('page');
// get the value of a $_POST parameter
$pageName = $request->request->get('page');
In a template, you can also access the Request object via the special app.request variable
automatically provided by Symfony:
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{{ app.request.query.get('page') }}
{{ app.request.request.get('page') }}
Persisting Data in the Session
Even if the HTTP protocol is stateless, Symfony provides a nice session object that represents the client
(be it a real person using a browser, a bot, or a web service). Between two requests, Symfony stores the
attributes in a cookie by using native PHP sessions.
Storing and retrieving information from the session can be easily achieved from any controller:
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use Symfony\Component\HttpFoundation\Session\Session;
public function indexAction(Session $session)
{
// store an attribute for reuse during a later user request
$session->set('foo', 'bar');
// get the value of a session attribute
$foo = $session->get('foo');
// use a default value if the attribute doesn't exist
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Chapter 3: The Controller | 18
generated on December 4, 2017