lumen 多语言支持

先增加一个中间件app/Http/Middleware/LangMiddleware.php

<?php
namespace App\Http\Middleware;
use Closure;
class LangMiddleware
{
    /**
     * 多语言处理中间件
     * @param         $request
     * @param Closure $next
     * @return mixed
     */
    public function handle($request, Closure $next)
    {
        $host = $request->getHost();
        switch ($host){
            case 'zh.baidu.io':
                $lang = 'zh';
                break;
            case 'en.baidu.io':
                $lang = 'en';
                break;
            default:
                $lang = 'zh';
        }
        app('translator')->setLocale($lang);
        return $next($request);
    }
}

然后在bootstrap/app.php里注册为全局中间件

<?php
$app->middleware([
    # App\Http\Middleware\CrossHttp::class,
    App\Http\Middleware\LangMiddleware::class,
    # App\Http\Middleware\ExampleMiddleware::class
]);

语言定义文件在 resource/lang目录下：

resources/lang/zh/message.php内容实例：

<?php
return [
    'validation_failed' => '验证失败。',
];

代码里调用翻译：

use Illuminate\Support\Facades\Lang;
$output = Lang::get('message.validation_failed');