information-platform/app/Http/Middleware/Language.php

<?php

/*
 * This file is part of the Jiannei/lumen-api-starter.
 *
 * (c) Jiannei <longjian.huang@foxmail.com>
 *
 * This source file is subject to the MIT license that is bundled
 * with this source code in the file LICENSE.
 */

namespace App\Http\Middleware;

use Carbon\Carbon;
use Closure;
use Illuminate\Auth\Access\AuthorizationException;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\App;

class Language
{

    /**
     * Handle an incoming request.
     *
     * @param Request $request
     * @param Closure $next
     * @param string|null $guard
     *
     * @return mixed
     *
     * @throws AuthorizationException
     */
    public function handle($request, Closure $next)
    {
        $language = $request->header('language');
        if (in_array($language, ['en', 'zh_CH']) && App::getLocale() != $language) {
            App::setLocale($language);
        }
        return $next($request);
    }
}