ENHANCEMENT: fixing the locale

src/EventSubscriber/LocaleSubscriber.php

@@ -0,0 +1,42 @@
+<?php
+
+// src/EventSubscriber/LocaleSubscriber.php
+namespace App\EventSubscriber;
+
+use Symfony\Component\EventDispatcher\EventSubscriberInterface;
+use Symfony\Component\HttpKernel\Event\RequestEvent;
+use Symfony\Component\HttpKernel\KernelEvents;
+
+class LocaleSubscriber implements EventSubscriberInterface
+{
+    private $defaultLocale;
+
+    public function __construct(string $defaultLocale = 'en')
+    {
+        $this->defaultLocale = $defaultLocale;
+    }
+
+    public function onKernelRequest(RequestEvent $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 [
+            // must be registered before (i.e. with a higher priority than) the default Locale listener
+            KernelEvents::REQUEST => [['onKernelRequest', 20]],
+        ];
+    }
+}