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app/Http/Controllers/LocaleController.php

@@ -0,0 +1,20 @@
+<?php
+
+namespace App\Http\Controllers;
+
+use Illuminate\Http\RedirectResponse;
+use Illuminate\Http\Request;
+
+class LocaleController extends Controller
+{
+    public function __invoke(Request $request, string $locale): RedirectResponse
+    {
+        $supportedLocales = array_keys((array) config('app.supported_locales', []));
+
+        abort_unless(in_array($locale, $supportedLocales, true), 404);
+
+        $request->session()->put('locale', $locale);
+
+        return back();
+    }
+}