## laravel使用中間件 ### 中間件方法`handle` ### 中間件必須注入 `$request, Closure $next` ### 中間件必須返回 `return $next($request);` ### 中間件路由 `'middleware' => ['web', 'App\Http\Middleware\Admin']` ### 中間件路由 `->middleware('first',?'second');` ``` namespace App\Http\Middleware; use Illuminate\Http\Middleware\TrustHosts as Middleware; use Closure; class Admin { public function handle($request, Closure $next) { echo '后臺'; // Perform action return $next($request); } } ```