Php Symfony 2，切换语言不起作用

我想知道为什么当我点击视图上的链接切换语言时它不起作用。如果我将默认语言环境设置为en或km，它将分别显示英语或高棉语。我有什么问题，我不能点击下面的链接切换语言吗？请帮帮我！非常感谢您的回答

在视图中

<div class="col-sm-3 language-switcher">
    <a href="{{ path('ngs_locale', {locale: 'en'}) }}">English</a> |
    <a href="{{ path('ngs_locale', {locale: 'km'}) }}">ខ្មែរ</a>
</div>

LocaleController.php

namespace NGS\HomeBundle\Controller;

use Symfony\Component\HttpFoundation\Request;
use Symfony\Bundle\FrameworkBundle\Controller\Controller;

class LocaleController extends Controller
{
    public function localeAction(Request $request, $locale)
    {
        /** ======== dump ========== **/
        dump($locale); //"km"
        $request->getSession()->set('_locale', $locale);

        /** ======== dump ========== **/
        dump($request->getLocale()); //"en"

        $referer = $request->headers->get('referer');

        /** ======== dump ========== **/
        dump($referer);die; // null

        if (empty($referer)) {
            throw $this->createNotFoundException('ngs_not_found');
        }

        return $this->redirect($referer);
    }
}

LocaleListener.php

namespace NGS\HomeBundle\EventListener;

use Symfony\Component\HttpKernel\Event\GetResponseEvent;
use Symfony\Component\HttpKernel\KernelEvents;
use Symfony\Component\EventDispatcher\EventSubscriberInterface;

class LocaleListener implements EventSubscriberInterface
{
    private $defaultLocale;

    public function __construct($defaultLocale = 'en')
    {
        $this->defaultLocale = $defaultLocale;
    }

    public function onKernelRequest(GetResponseEvent $event)
    {
        $request = $event->getRequest();
        if (!$request->hasPreviousSession()) {
            return;
        }

        // try to see if the locale has been set as a _locale routing parameter
        if ($locale = $request->attributes->get('_locale')) {
            $request->getSession()->set('_locale', $locale);
        } else {
            // if no explicit locale has been set on this request, use one from the session
            $request->setLocale($request->getSession()->get('_locale', $this->defaultLocale));
        }
    }

    public static function getSubscribedEvents()
    {
        return array(
            // must be registered before the default Locale listener
            KernelEvents::REQUEST => array(array('onKernelRequest', 17)),
        );
    }
}

Service.yml

services:
ngs_home.locale_listener:
    class: NGS\HomeBundle\EventListener\LocaleListener
    arguments: ["%kernel.default_locale%"]
    tags:
        - { name: kernel.event_subscriber }

现在，我解决了我的问题： 首先，我更改了链接：从locale到_locale

<div class="col-sm-3 language-switcher">
    <a href="{{ path('ngs_locale', {_locale: 'en'}) }}">English</a> |
    <a href="{{ path('ngs_locale', {_locale: 'km'}) }}">ខ្មែរ</a>
</div>

ngs_locale:
    path:     locale/{_locale}
    defaults: { _controller: NGSHomeBundle:Locale:locale 

第三，我更改了LocaleController.php。删除了$locale参数，然后通过$request->getLocale（）获取$locale

第四，我为HomeBundle DependencyInjection\Configuration.php和DependencyInjection\NGSHomeExtension.php添加了DependencyInjection

---

就这样

这是用于粘性区域的吗？你不需要在路由文件上设置你的要求吗？我不确定，我会试试。我像下面那样试过，但它还不起作用

ngs_locale:path:locale/{locale}默认值：{u控制器：NGSHomeBundle:locale:locale}要求：{u locale:en | km

您得到的错误是什么？你能用这个错误更新你的问题吗？或者没有错误，只是它不会更改会话中的_语言环境？没有错误显示，只是不会更改会话中的_语言环境

ngs_locale:
    path:     locale/{_locale}
    defaults: { _controller: NGSHomeBundle:Locale:locale 

public function localeAction(Request $request)
{
    $locale = $locale = $request->getLocale();
    $request->getSession()->set('_locale', $locale);

    $referer = $request->headers->get('referer');
    if (empty($referer)) {
        throw $this->createNotFoundException('ngs_not_found');
    }

    return $this->redirect($referer);
}