Symfony2 session学习笔记

以前老版本2.2及以前的session用法是

$session = $this->getRequest()->getSession();

$session->set('foo', 'bar');

$foobar = $session->get('foobar');

后来Symfony2.3开始$this->getRequest()方法被废弃，session的使用方法就变成了

use SymfonyComponentHttpFoundationRequest;
public function indexAction(Request $request)
{
    $session = $request->getSession();
    // store an attribute for reuse during a later user request
    $session->set('foo', 'bar');
    // get the attribute set by another controller in another request
    $foobar = $session->get('foobar');
    // use a default value if the attribute doesn't exist
    $filters = $session->get('filters', array());
}