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app/Http/Middleware/SetLocale.php

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+<?php
+
+namespace App\Http\Middleware;
+
+use Closure;
+use Illuminate\Http\Request;
+use Symfony\Component\HttpFoundation\Response;
+
+class SetLocale
+{
+    public function handle(Request $request, Closure $next): Response
+    {
+        $supportedLocales = array_keys((array) config('app.supported_locales', []));
+        $defaultLocale = (string) config('app.locale', 'ru');
+
+        $locale = (string) $request->session()->get('locale', $defaultLocale);
+        if (!in_array($locale, $supportedLocales, true)) {
+            $locale = $defaultLocale;
+        }
+
+        app()->setLocale($locale);
+
+        return $next($request);
+    }
+}