本文实例讲述了Laravel5.1框架注册中间件的三种场景。分享给大家供大家参考，具体如下：
在Laravel中注册中间件主要有三种场景，一种给控制器中的方法进行注册，一种是给整个控制器进行注册，最后一种是给全局注册中间件。
这种需求是最为常见，这个例子是给IndexController中的index方法添加中间件。
Route::get('/', ['middleware'=>['App/Http/Middleware/EmailMiddleware'],'uses'=>'IndexController@index']); 这种需求有的时候也会出现，如果给整个控制器中注册中间件，那么这个控制器中的所有方法都注册了该中间件。跟我一起来找到答案！
控制器基类（Controller.php）
首先来看一下控制器基类，可以看到Controller类继承了BaseController类，而BaseController的路径是Illuminate/Routing/Controller，然后我们来看看Laravel的源码。
<?phpnamespace App/Http/Controllers;use Illuminate/Foundation/Bus/DispatchesJobs;use Illuminate/Routing/Controller as BaseController;use Illuminate/Foundation/Validation/ValidatesRequests;use Illuminate/Foundation/Auth/Access/AuthorizesRequests;abstract class Controller extends BaseController{ use AuthorizesRequests, DispatchesJobs, ValidatesRequests;} BaseController类
从源码中我们可以看到有一个属性为middleware，这个middleware属性就是我们要找的，所以只要在需要注册的控制器下使用这个属性即可完成注册。
protected $middleware = [];
<?phpnamespace Illuminate/Routing;use BadMethodCallException;use Symfony/Component/HttpKernel/Exception/NotFoundHttpException;abstract class Controller{ /** * The middleware registered on the controller. * * @var array */ protected $middleware = []; /** * Register middleware on the controller. * * @param array|string|/Closure $middleware * @param array $options * @return /Illuminate/Routing/ControllerMiddlewareOptions */ public function middleware($middleware, array $options = []) { foreach ((array) $middleware as $m) { $this->middleware[] = [ 'middleware' => $m, 'options' => &$options, ]; } return new ControllerMiddlewareOptions($options); } /** * Get the middleware assigned to the controller. * * @return array */ public function getMiddleware() { return $this->middleware; } /** * Execute an action on the controller. * * @param string $method * @param array $parameters * @return /Symfony/Component/HttpFoundation/Response */ public function callAction($method, $parameters) { return call_user_func_array([$this, $method], $parameters); } /** * Handle calls to missing methods on the controller. * * @param array $parameters * @return mixed * * @throws /Symfony/Component/HttpKernel/Exception/NotFoundHttpException */ public function missingMethod($parameters = []) { throw new NotFoundHttpException('Controller method not found.'); } /** * Handle calls to missing methods on the controller. * * @param string $method * @param array $parameters * @return mixed * * @throws /BadMethodCallException */ public function __call($method, $parameters) { throw new BadMethodCallException("Method [{$method}] does not exist."); } 给整个控制器注册中间件
我们选用系统的Authenticate中间件来举例，这个中间件是用于检测用户是否登录。
注意：中间件的名称为键，值可以是一个空数组
protected $middleware = ['/App/Http/Middleware/Authenticate'=>[]];
打开app/Http/Kernel.php，这是一个内核文件，可以看到一个属性$middleware，我们只需要将我们自定义的中间件的路径添加到这个$middleware 这个属性中即可。
此外还有一个$routeMiddleware属性，使用这个属性可以根据路由来注册中间件。
我们的路由有：goods/info，goods/detail两个路由器
我们可以将$routeMiddleware属性添加一行
'goods.*' => /App/Http/Middleware/GoodsMiddleware::class,
<?phpnamespace App/Http;use Illuminate/Foundation/Http/Kernel as HttpKernel;class Kernel extends HttpKernel{ /** * The application's global HTTP middleware stack. * * @var array */ protected $middleware = [ /Illuminate/Foundation/Http/Middleware/CheckForMaintenanceMode::class, /App/Http/Middleware/EncryptCookies::class, /Illuminate/Cookie/Middleware/AddQueuedCookiesToResponse::class, /Illuminate/Session/Middleware/StartSession::class, /Illuminate/View/Middleware/ShareErrorsFromSession::class, /App/Http/Middleware/VerifyCsrfToken::class, ]; /** * The application's route middleware. * * @var array */ protected $routeMiddleware = [ 'auth' => /App/Http/Middleware/Authenticate::class, 'auth.basic' => /Illuminate/Auth/Middleware/AuthenticateWithBasicAuth::class, 'guest' => /App/Http/Middleware/RedirectIfAuthenticated::class, ];} 希望本文所述对大家基于Laravel框架的PHP程序设计有所帮助。
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