Symfony：如何在注销后显示成功消息

在Symfony中，用户成功注销后，如何显示“您已成功注销”之类的成功消息？

1）创建一个新服务来处理注销成功事件。

In services.yml添加服务：

logout_success_handler:
    class: Path\To\YourBundle\Services\LogoutSuccessHandler
    arguments: ['@security.http_utils']

并添加类，替换/path/to/your/login与您的登录页面的网址（在控制器的最后一行）：

<?php

namespace Path\To\YourBundle\Services;

use Symfony\Component\HttpFoundation\Request;
use Symfony\Component\Security\Http\HttpUtils;
use Symfony\Component\Security\Http\Logout\LogoutSuccessHandlerInterface;

class LogoutSuccessHandler implements LogoutSuccessHandlerInterface
{
    protected $httpUtils;
    protected $targetUrl;

    /**
     * @param HttpUtils $httpUtils
     */
    public function __construct(HttpUtils $httpUtils)
    {
        $this->httpUtils = $httpUtils;

        $this->targetUrl = '/path/to/your/login?logout=success';
    }

    /**
     * {@inheritdoc}
     */
    public function onLogoutSuccess(Request $request)
    {
        $response = $this->httpUtils->createRedirectResponse($request, $this->targetUrl);

        return $response;
    }
}

2) 配置您的security.yml使用自定义LogoutSuccessHandler刚刚创建：

firewalls:
    # ...
    your_firewall:
        # ...
        logout:
            # ...
            success_handler: logout_success_handler

3）在登录页面的twig模板中添加：

{% if app.request.get('logout') == "success" %}
    <p>You have successfully logged out!</p>
{% endif %}