symfony localelistener

1// src/EventSubscriber/LocaleSubscriber.php
2namespace App\EventSubscriber;
3
4use Symfony\Component\EventDispatcher\EventSubscriberInterface;
5use Symfony\Component\HttpKernel\Event\RequestEvent;
6use Symfony\Component\HttpKernel\KernelEvents;
7
8class LocaleSubscriber implements EventSubscriberInterface
9{
10    private $defaultLocale;
11
12    public function __construct(string $defaultLocale = 'en')
13    {
14        $this->defaultLocale = $defaultLocale;
15    }
16
17    public function onKernelRequest(RequestEvent $event)
18    {
19        $request = $event->getRequest();
20        if (!$request->hasPreviousSession()) {
21            return;
22        }
23
24        // try to see if the locale has been set as a _locale routing parameter
25        if ($locale = $request->attributes->get('_locale')) {
26            $request->getSession()->set('_locale', $locale);
27        } else {
28            // if no explicit locale has been set on this request, use one from the session
29            $request->setLocale($request->getSession()->get('_locale', $this->defaultLocale));
30        }
31    }
32
33    public static function getSubscribedEvents()
34    {
35        return [
36            // must be registered before (i.e. with a higher priority than) the default Locale listener
37            KernelEvents::REQUEST => [['onKernelRequest', 20]],
38        ];
39    }
40}
41