parking_manage_system/app/Http/Middleware/LanguageSwitcher.php

<?php

namespace App\Http\Middleware;

use Closure;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\App;
use Illuminate\Support\Facades\Auth;
use Illuminate\Support\Facades\Session;

class LanguageSwitcher
{
    public function handle(Request $request, Closure $next)
    {
        $token = $request->header('auth');
        if ($token) {
            $request->headers->set('Authorization', 'Bearer ' . $token);
        }
        // 优先使用用户设置的语言
        if (Auth::guard('sanctum')->check()
            && Auth::guard('sanctum')->user()->locale
        ) {
            App::setLocale(auth('sanctum')->user()->locale);
        } // 其次使用会话中的语言设置
        elseif (Session::has('locale')) {
            App::setLocale(Session::get('locale'));
        } // 最后使用浏览器默认语言
        else {
            App::setLocale(
                $request->getPreferredLanguage(config('app.available_locales'))
                    ?: config('app.fallback_locale')
            );
        }

        return $next($request);
    }
}