已发送Symfony 2会话头?

时间:2012-10-22 00:08:17

标签: symfony

我试图开始(或访问)这样的会话:

    $session = new Session();
    echo $session->getId();

根据文档应该是我需要的,因为会话自动启动(http://symfony.com/doc/master/components/http_foundation/sessions.html):

While it is recommended to explicitly start a session, a sessions will actually start 
on demand, that is, if any session request is made to read/write session data.

然而,我得到了错误

Failed to start the session because headers have already been sent.

这是调用该服务的原始控制器:

use Symfony\Bundle\FrameworkBundle\Controller\Controller;
use Symfony\Bundle\FrameworkBundle\Routing\Router;
use Symfony\Component\HttpFoundation\Response;

        $auth = $this->get('authentication');
        $user_id = $auth->getUserId();

然后是getUserId函数:

use Symfony\Bundle\FrameworkBundle\Controller\Controller;
use Symfony\Component\HttpFoundation\Response;
use Symfony\Component\HttpFoundation\Session\Session;

public function getUserId() {
    $session = new Session();
    echo $session->getId();

如果我将getUserId更改为如下所示:

public function getUserId() {
    $session = $this->getRequest()->getSession();
    echo $session->getId();

我收到错误:

Call to a member function get() on a non-object

1 个答案:

答案 0 :(得分:2)

您正在查看独立组件“HTTP Foundation”的文档。这意味着在使用全栈框架symfony2时必须非常小心。

Symfony2已经处理了请求/响应和会话,因此您不需要创建任何Session对象。您可以在常规文档章节Controller中阅读有关如何使用会话的信息。

要访问控制器中的会话,您只需要

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

如果要访问服务中的会话,则需要在service.yml中将服务“请求”作为依赖项传递,然后通过

访问会话
$session = $request->getSession();

如果您不习惯,Service Container章节有一些说明。