symfony get post params

use Symfony\Component\HttpFoundation\Request;

$request = Request::createFromGlobals();

// the URI being requested (e.g. /about) minus any query parameters
$request->getPathInfo();

// retrieves $_GET and $_POST variables respectively
$request->query->get('id');
$request->request->get('category', 'default category');

// retrieves $_SERVER variables
$request->server->get('HTTP_HOST');

// retrieves an instance of UploadedFile identified by "attachment"
$request->files->get('attachment');

// retrieves a $_COOKIE value
$request->cookies->get('PHPSESSID');

// retrieves an HTTP request header, with normalized, lowercase keys
$request->headers->get('host');
$request->headers->get('content-type');

$request->getMethod();    // e.g. GET, POST, PUT, DELETE or HEAD
$request->getLanguages(); // an array of languages the client accepts