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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 Illuminate\Support\Facades\App;
+use Illuminate\Support\Facades\URL;
+use Illuminate\Support\Facades\View;
+use Symfony\Component\HttpFoundation\Response;
+
+class SetLocale
+{
+    /**
+     * Validate the {locale} route segment, apply it app-wide, and share
+     * the current/alternate locale (and the alternate's URL) with all views
+     * so the header switcher and layout hreflang tags don't recompute it.
+     */
+    public function handle(Request $request, Closure $next): Response
+    {
+        $locale = $request->route('locale');
+        $available = config('app.available_locales');
+
+        if (! in_array($locale, $available, true)) {
+            abort(404);
+        }
+
+        App::setLocale($locale);
+
+        // Lets route() calls omit {locale} anywhere in the request lifecycle
+        // (controllers, views) — without this, every route() call inside the
+        // {locale} group would need locale passed explicitly every time.
+        URL::defaults(['locale' => $locale]);
+
+        $altLocale = collect($available)->first(fn ($l) => $l !== $locale);
+        $routeName = $request->route()->getName();
+
+        View::share('currentLocale', $locale);
+        View::share('altLocale', $altLocale);
+        View::share(
+            'altLocaleUrl',
+            $routeName
+                ? route($routeName, array_merge($request->route()->parameters(), ['locale' => $altLocale]))
+                : url('/'.$altLocale),
+        );
+
+        return $next($request);
+    }
+}