Laravel Reponse响应客户端示例详解

protected function sendRequestThroughRouter($request)
{
 $this->app->instance('request', $request);
 Facade::clearResolvedInstance('request');

 $this->bootstrap();
 
 // 代码如下
 return (new Pipeline($this->app))
 ->send($request)
 ->through($this->app->shouldSkipMiddleware() ? [] : $this->middleware)
 // 此方法将当前请求挂载到容器，然后执行路由器的分发
 ->then($this->dispatchToRouter());
}

protected function dispatchToRouter()
{
 return function ($request) {
 $this->app->instance('request', $request);
 return $this->router->dispatch($request);
 };
}

public function dispatch(Request $request)
{ 
 $this->currentRequest = $request;
 // 将请求分发到路由
 // 跳转到dispatchToRoute方法
 return $this->dispatchToRoute($request);
}

public function dispatchToRoute(Request $request)
{ 
 // 先跳转到findRoute方法
 return $this->runRoute($request, $this->findRoute($request));
}

// 见名之意 通过给定的$request 找到匹配的路由
protected function findRoute($request)
{ 
 // 跳转到IlluminateRoutingRouteCollection::match方法
 $this->current = $route = $this->routes->match($request);
 $this->container->instance(Route::class, $route);
 return $route;
}

/**
 * Find the first route matching a given request.
 *
 * @param IlluminateHttpRequest $request
 * @return IlluminateRoutingRoute
 *
 * @throws SymfonyComponentHttpKernelExceptionNotFoundHttpException
 */
public function match(Request $request)
{ 
 // 根据请求动作找到全局匹配的路由
 // 可以自行打印下$routes
 $routes = $this->get($request->getMethod());
 // 匹配路由 下面查看框架如何生成的路由规则!!!
 $route = $this->matchAgainstRoutes($routes, $request);
 
 if (! is_null($route)) {
 return $route->bind($request);
 }

 $others = $this->checkForAlternateVerbs($request);

 if (count($others) > 0) {
 return $this->getRouteForMethods($request, $others);
 }

 throw new NotFoundHttpException;
}

// 主要逻辑是调用服务提供者的boot方法
array_walk($this->serviceProviders, function ($p) {
 $this->bootProvider($p);
});

public function boot()
{
 // 调用父类IlluminateFoundationSupportProvidersRouteServiceProvider的boot方法
 parent::boot();
}

public function boot()
{ 
 $this->setRootControllerNamespace();

 if ($this->routesAreCached()) {
 $this->loadCachedRoutes();
 } else {
 // 就看这个loadRoutes方法
 $this->loadRoutes();

 $this->app->booted(function () {
  // dd(get_class($this->app['router']));
  $this->app['router']->getRoutes()->refreshNameLookups();
  $this->app['router']->getRoutes()->refreshActionLookups();
 });
 }
}

/**
 * Load the application routes.
 * 看注释就知道我们来对了地方
 * @return void
 */
protected function loadRoutes()
{ 
 // 调用AppProvidersRouteServiceProvider的map方法
 if (method_exists($this, 'map')) {
 $this->app->call([$this, 'map']);
 }
}

public function map()
{ 
 // 为了调试方便我注释掉了api路由
 // $this->mapApiRoutes();
 
 // 这两个都是加载路由文件 这里查看web.php
 $this->mapWebRoutes();
}

protected function mapWebRoutes()
{ 
 // 调用Router的__call方法 返回的是RouteRegistrar实例
 Route::middleware('web')
 ->namespace($this->namespace)
 // 调用RouteRegistrar的namespace方法 触发__call魔术方法
 
 // 依然是挂载属性 可自行打印
 // IlluminateRoutingRouteRegistrar {#239 ▼
 // #router: IlluminateRoutingRouter {#34 ▶}
 // #attributes: array:2 [▼
 // "middleware" => array:1 [▼
 // 0 => "web"
 // ]
 // "namespace" => "AppHttpControllers"
 // ]
 // #passthru: array:7 [▶]
 // #allowedAttributes: array:7 [▶]
 // #aliases: array:1 [▶]
 // }
 
 // 调用RouteRegistrar的group方法
 ->group(base_path('routes/web.php'));
}

public function __call($method, $parameters)
{ 
 if (static::hasMacro($method)) {
 return $this->macroCall($method, $parameters);
 }
 
 if ($method === 'middleware') {
 // 调用了RouteRegistrar的attribute方法 只是挂载路由属性
 return (new RouteRegistrar($this))->attribute($method, is_array($parameters[0]) ? $parameters[0] : $parameters);
 }

 return (new RouteRegistrar($this))->attribute($method, $parameters[0]);
}

public function __call($method, $parameters)
{ 
 if (in_array($method, $this->passthru)) {
  // 当使用get post等方法的时候
  return $this->registerRoute($method, ...$parameters);
 }

 if (in_array($method, $this->allowedAttributes)) {
  if ($method === 'middleware') {
   return $this->attribute($method, is_array($parameters[0]) ? $parameters[0] : $parameters);
  }
  // dd($method); // namespace
  return $this->attribute($method, $parameters[0]);
 }

 throw new BadMethodCallException(sprintf(
  'Method %s::%s does not exist.', static::class, $method
 ));
}

public function group($callback)
{ 
 // dd($this->attributes, $callback);
 // array:2 [▼
 //  "middleware" => array:1 [▼
 //   0 => "web"
 //  ]
 //  "namespace" => "AppHttpControllers"
 // ]
 // "/home/vagrant/code/test1/routes/web.php"
 
 // 查看Router的group方法
 $this->router->group($this->attributes, $callback);
}

public function group(array $attributes, $routes)
{
 $this->updateGroupStack($attributes);
 
 // 查看loadRoutes方法 /home/vagrant/code/test1/routes/web.php
 $this->loadRoutes($routes);

 array_pop($this->groupStack);
}

protected function loadRoutes($routes)
{ 
 if ($routes instanceof Closure) {
  // 用于闭包嵌套 laravel的路由是可以随意潜逃组合的
  $routes($this);
 } else {
  // 加载路由文件 /home/vagrant/code/test1/routes/web.php
  (new RouteFileRegistrar($this))->register($routes);
 }
}

protected $router;

public function __construct(Router $router)
{ 
 $this->router = $router;
}

public function register($routes)
{
 $router = $this->router;
 // 终于加载到了路由文件
 // require("/home/vagrant/code/test1/routes/web.php");
 // 看到这里就到了大家熟悉的Route::get()等方法了
 // 道友们可能已经有了有趣的想法: 可以在web.php等路由文件中继续require其他文件
 // 便可实现不同功能模块的路由管理
 require $routes;
}

// web.php中
Route::get('routecontroller', "AppHttpControllersDebugTestController@index");

// 跳转到Router的get方法
/**
 * Register a new GET route with the router.
 *
 * @param string $uri
 * @param Closure|array|string|callable|null $action
 * @return IlluminateRoutingRoute
 */
public function get($uri, $action = null)
{ 
 // dump($uri, $action);
 // $uri = routecontroller
 // $action = AppHttpControllersDebugTestController@index
 // 跳转到addRoute方法
 return $this->addRoute(['GET', 'HEAD'], $uri, $action);
}

/**
 * Add a route to the underlying route collection.
 *
 * @param array|string $methods
 * @param string $uri
 * @param Closure|array|string|callable|null $action
 * @return IlluminateRoutingRoute
 */
//  ['GET', 'HEAD'], $uri, $action
public function addRoute($methods, $uri, $action)
{ 
 // routes是routecollection实例
 // 跳转到createRoute方法
 // 跳转到RouteCollection的add方法
 return $this->routes->add($this->createRoute($methods, $uri, $action));
}

/**
 * Create a new route instance.
 *
 * @param array|string $methods
 * @param string $uri
 * @param mixed $action
 * @return IlluminateRoutingRoute
 */
//        ['GET', 'HEAD'], $uri, $action
protected function createRoute($methods, $uri, $action)
{
 // 跳转到actionReferencesController方法
 if ($this->actionReferencesController($action)) {
  $action = $this->convertToControllerAction($action);
  // dump($action);
  // array:2 [▼
  //  "uses" => "AppHttpControllersDebugTestController@index"
  //  "controller" => "AppHttpControllersDebugTestController@index"
  // ]
 }
 
 // 创建一个对应路由规则的Route实例 并且添加到routes（collection）中
 // 返回到上面的addRoute方法
 // 请自行查看Route的构造方法
 $route = $this->newRoute(
  // dump($this->prefix);
  // routecontroller
  $methods, $this->prefix($uri), $action
 );

 if ($this->hasGroupStack()) {
  $this->mergeGroupAttributesIntoRoute($route);
 }

 $this->addWhereClausesToRoute($route);

 return $route;
}

/**
 * Determine if the action is routing to a controller.
 *
 * @param array $action
 * @return bool
 */
// 判断是否路由到一个控制器
protected function actionReferencesController($action)
{ 
 // 在此例子中Route::get方法传递的是一个字符串
 if (! $action instanceof Closure) {
  // 返回true
  return is_string($action) || (isset($action['uses']) && is_string($action['uses']));
 }

 return false;
}

/**
  * Add a Route instance to the collection.
  *
  * @param IlluminateRoutingRoute $route
  * @return IlluminateRoutingRoute
  */
public function add(Route $route)
{ 
 // 跳转吧
 $this->addToCollections($route);

 $this->addLookups($route);
 
 // 最终一路返回到Router的get方法 所以我们可以直接打印web.php定义的路由规则
 return $route;
}

/**
 * Add the given route to the arrays of routes.
 *
 * @param IlluminateRoutingRoute $route
 * @return void
 */
protected function addToCollections($route)
{
 $domainAndUri = $route->getDomain().$route->uri();
 // dump($route->getDomain(), $route->uri()); null routecontroller
 foreach ($route->methods() as $method) {
  // 将路由规则挂载到数组 方便匹配
  $this->routes[$method][$domainAndUri] = $route;
 }
 // 将路由规则挂载的数组 方便匹配
 $this->allRoutes[$method.$domainAndUri] = $route;
}

public function match(Request $request)
{ 
 // 获取符合当前请求动作的所有路由
 // 是一个Route对象数组 每一个对象对应一个route规则
 $routes = $this->get($request->getMethod());
 
 // 匹配到当前请求路由
 $route = $this->matchAgainstRoutes($routes, $request);
 
 if (! is_null($route)) {
  // 将绑定了请求的Route实例返回
  return $route->bind($request);
 }
 
 $others = $this->checkForAlternateVerbs($request);

 if (count($others) > 0) {
  return $this->getRouteForMethods($request, $others);
 }

 throw new NotFoundHttpException;
}

// 该方法中大量使用了collect方法 请查看laravel手册
protected function matchAgainstRoutes(array $routes, $request, $includingMethod = true)
{ 
 // dump(get_class_methods(get_class(collect($routes))));
 // dump(collect($routes)->all()); // items数组 protected属性
 // dump(collect($routes)->items); // items属性是一个数组
 
 // 当注册一个兜底路由的时候 （通过Route::fallback方法）对应$route的isFallback会被设为true
 
 // partition方法根据传入的闭包将集合分成两部分
 // 具体实现可以查看手册 集合部分
 [$fallbacks, $routes] = collect($routes)->partition(function ($route) {
  return $route->isFallback;
 });
 
 // 将兜底路由放到集合后面 并且通过first方法找到第一个匹配的路由
 return $routes->merge($fallbacks)->first(function ($value) use ($request, $includingMethod) {
  return $value->matches($request, $includingMethod);
 });
}

protected function findRoute($request)
{ 
 // 可以打印$route 你会发现和你在web.php中打印的是同一个Route对象
 $this->current = $route = $this->routes->match($request);
 // 将匹配到的路由实例挂载到容器
 $this->container->instance(Route::class, $route);

 return $route;
}

public function dispatchToRoute(Request $request)
{ 
 // 跳转到runRoute方法
 return $this->runRoute($request, $this->findRoute($request));
}

protected function runRoute(Request $request, Route $route)
{ 
 // 给request帮顶当前的route 可以使用$request->route()方法 获取route实例
 // 你也可以随时在你的业务代码中通过容器获得当前Route实例 
 // app(IlluminateRoutingRoute::class)
 $request->setRouteResolver(function () use ($route) {
  return $route;
 });
 
 $this->events->dispatch(new RouteMatched($route, $request));
 
 // 开始准备响应了
 return $this->prepareResponse($request,
         // 跳转到runRouteWithinStack方法
         $this->runRouteWithinStack($route, $request)
         );
}

protected function runRouteWithinStack(Route $route, Request $request)
{
 $shouldSkipMiddleware = $this->container->bound('middleware.disable') &&
  $this->container->make('middleware.disable') === true;

 $middleware = $shouldSkipMiddleware ? [] : $this->gatherRouteMiddleware($route);
 
 // 依旧是一个pipeline 我们跳转到$route->run方法
 return (new Pipeline($this->container))
  ->send($request)
  ->through($middleware)
  ->then(function ($request) use ($route) {
   return $this->prepareResponse(
    
    $request, $route->run()
   );
  });
}

public function run()
{
 $this->container = $this->container ?: new Container;

 try {
  // 如果是一个控制器路由规则
  // 显然我们的此条路由是一个控制器路由
  if ($this->isControllerAction()) {
   // 将执行的结果返回给$route->run()
   // 跳回到上面的prepareResponse方法
   return $this->runController();
  }
 
  // 如果是一个闭包路由规则ControllerDispatcher
  return $this->runCallable();
 } catch (HttpResponseException $e) {
  return $e->getResponse();
 }
}

/**
 * Run the route action and return the response.
 *
 * @return mixed
 *
 * @throws SymfonyComponentHttpKernelExceptionNotFoundHttpException
 */
protected function runController()
{
 // 
 return $this->controllerDispatcher()->dispatch(
  $this,
  // 通过容器解析当前路由控制器实例
  $this->getController(),
  // 获取当前路由控制器方法
  $this->getControllerMethod()
 );
}

/**
 * Dispatch a request to a given controller and method.
 *
 * @param IlluminateRoutingRoute $route
 * @param mixed $controller
 * @param string $method
 * @return mixed
 */
public function dispatch(Route $route, $controller, $method)
{
 $parameters = $this->resolveClassMethodDependencies(
  $route->parametersWithoutNulls(), $controller, $method
 );

 if (method_exists($controller, 'callAction')) {
  // 执行基类控制器中的callAction方法并返回执行结果
  return $controller->callAction($method, $parameters);
 }
 
 return $controller->{$method}(...array_values($parameters));
}

protected function runRouteWithinStack(Route $route, Request $request)
{
 $shouldSkipMiddleware = $this->container->bound('middleware.disable') &&
  $this->container->make('middleware.disable') === true;

 $middleware = $shouldSkipMiddleware ? [] : $this->gatherRouteMiddleware($route);

 return (new Pipeline($this->container))
  ->send($request)
  ->through($middleware)
  ->then(function ($request) use ($route) {
   return $this->prepareResponse(
    // 返回到这里 然后执行prepareResponse方法
    $request, $route->run()
   );
  });
}

// 实际调用的是toResponse方法
// 注意这里的$response是直接从控制器中返回的任何东西
public static function toResponse($request, $response)
{
 if ($response instanceof Responsable) {
  // 我们当然可以直接从控制器中返回一个实现了Responsable接口的实例
  $response = $response->toResponse($request);
 }

 if ($response instanceof PsrResponseInterface) {
  // 什么？？？ laravel还支持psr7？？ 当然了 后面会附上使用文档
  $response = (new HttpFoundationFactory)->createResponse($response);
 } elseif ($response instanceof Model && $response->wasRecentlyCreated) {
  // 知道为什么laravel允许直接返回一个模型了吗
  $response = new JsonResponse($response, 201);
 } elseif (! $response instanceof SymfonyResponse &&
    // 知道laravel为什么允许你直接返回数组了吗
    ($response instanceof Arrayable ||
    $response instanceof Jsonable ||
    $response instanceof ArrayObject ||
    $response instanceof JsonSerializable ||
    is_array($response))) {
  $response = new JsonResponse($response);
 } elseif (! $response instanceof SymfonyResponse) {
  // 如果没匹配到 比如response是一个字符串，null等 直接生成响应类
  // 我们从laravel的Response构造方法开始梳理
  $response = new Response($response);
 }

 if ($response->getStatusCode() === Response::HTTP_NOT_MODIFIED) {
  $response->setNotModified();
 }
 
 return $response->prepare($request);
}

// SymfonyComponentHttpFoundationResponse
public function __construct($content = '', int $status = 200, array $headers = [])
{ 
 // 可以看到基本什么都没做
 $this->headers = new ResponseHeaderBag($headers);
 // 调用IlluminateHttpResponse的setContent方法 设置响应内容呗
 $this->setContent($content);
 $this->setStatusCode($status);
 $this->setProtocolVersion('1.0');
}

// IlluminateHttpResponse::setContent
public function setContent($content)
{
 $this->original = $content;
 
 // shouldBeJson方法将实现了特定接口的response或者是一个array的response转换为
 // 并设置响应头
 if ($this->shouldBeJson($content)) {
  $this->header('Content-Type', 'application/json');
 // morphToJson方法保证最终给此响应设置的响应内容为json串
  $content = $this->morphToJson($content);
 }
 
 elseif ($content instanceof Renderable) {
  $content = $content->render();
 }
 
 // SymfonyComponentHttpFoundationResponse 如果最终设置的响应内容不是null或者字符串或者实现了__toString方法的类 那么跑出异常， 否则设置响应内容
 parent::setContent($content);

 return $this;
}

// SymfonyComponentHttpFoundationResponse::setContent方法
public function setContent($content)
{
 if (null !== $content && !is_string($content) && !is_numeric($content) && !is_callable([$content, '__toString'])) {
  // php官方建议不要使用gettype方法获取变量的类型
  throw new UnexpectedValueException(sprintf('The Response content must be a string or object implementing __toString(), "%s" given.', gettype($content)));
 }
 // (string) 会触发__toString方法 如何对象允许的话
 $this->content = (string) $content;
 return $this;
}

/**
 * Prepares the Response before it is sent to the client.
 *
 * This method tweaks the Response to ensure that it is
 * compliant with RFC 2616. Most of the changes are based on
 * the Request that is "associated" with this Response.
 *
 * @return $this
 */
// 总的来说就是设置各种响应头 注意此时并未发送响应
public function prepare(Request $request)
{ 
 $headers = $this->headers;
 // 如果是100 204 304系列的状态码 就删除响应数据 删除对应的数据头 
 if ($this->isInformational() || $this->isEmpty()) {
  $this->setContent(null);
  $headers->remove('Content-Type');
  $headers->remove('Content-Length');
 } else {
  // Content-type based on the Request
  if (!$headers->has('Content-Type')) {
   $format = $request->getPreferredFormat();
   if (null !== $format && $mimeType = $request->getMimeType($format)) {
    $headers->set('Content-Type', $mimeType);
   }
  }

  // Fix Content-Type
  $charset = $this->charset ?: 'UTF-8';
  if (!$headers->has('Content-Type')) {
   $headers->set('Content-Type', 'text/html; charset='.$charset);
  } elseif (0 === stripos($headers->get('Content-Type'), 'text/') && false === stripos($headers->get('Content-Type'), 'charset')) {
   // add the charset
   $headers->set('Content-Type', $headers->get('Content-Type').'; charset='.$charset);
  }

  // Fix Content-Length
  if ($headers->has('Transfer-Encoding')) {
   $headers->remove('Content-Length');
  }

  if ($request->isMethod('HEAD')) {
   // cf. RFC2616 14.13
   $length = $headers->get('Content-Length');
   $this->setContent(null);
   if ($length) {
    $headers->set('Content-Length', $length);
   }
  }
 }

 // Fix protocol
 if ('HTTP/1.0' != $request->server->get('SERVER_PROTOCOL')) {
  $this->setProtocolVersion('1.1');
 }

 // Check if we need to send extra expire info headers
 if ('1.0' == $this->getProtocolVersion() && false !== strpos($headers->get('Cache-Control'), 'no-cache')) {
  $headers->set('pragma', 'no-cache');
  $headers->set('expires', -1);
 }

 $this->ensureIEOverSSLCompatibility($request);

 if ($request->isSecure()) {
  foreach ($headers->getCookies() as $cookie) {
   $cookie->setSecureDefault(true);
  }
 }

 return $this;
}

// 至此我们的响应封装好了 等待发送给客户端
// 在发送之前 还要将响应逐步返回
// 值得注意的是 如果你给此路由设置了后置中间件 可能如下
public function handle($request, Closure $next)
{ 
 // 此时拿到的$response就是我们上面响应好了一切 准备发送的响应了 希望你能理解后置中间件的作用了
 $response = $next($request);
 // header方法位于ResponseTrait
 $response->header('Server', 'xy');
 return $response;
}

响应返回到Router::runRoute方法
再返回到Router::dispatchToRoute方法
再返回到Router::dispatch方法
再返回到IlluminateFoundationHttp::sendRequestThroughRouter方法 （注意只要是通过了管道都要注意中间件的类型）
最终返回到index.php中
 
$response = $kernel->handle(
 $request = IlluminateHttpRequest::capture()
);

$response->send();

$kernel->terminate($request, $response);

public function send()
{ 
 // 先发送响应头
 $this->sendHeaders();
 // 再发送响应主体
 $this->sendContent();

 if (function_exists('fastcgi_finish_request')) {
  fastcgi_finish_request();
 } elseif (!in_array(PHP_SAPI, ['cli', 'phpdbg'], true)) {
  static::closeOutputBuffers(0, true);
 }

 return $this;
}

public function sendHeaders()
{
 // headers have already been sent by the developer
 if (headers_sent()) {
  return $this;
 }

 // headers
 foreach ($this->headers->allPreserveCaseWithoutCookies() as $name => $values) {
  $replace = 0 === strcasecmp($name, 'Content-Type');
  foreach ($values as $value) {
   // 将之前设置的各种头发送出去
   header($name.': '.$value, $replace, $this->statusCode);
  }
 }

 // cookies
 foreach ($this->headers->getCookies() as $cookie) {
  // 告诉客户端要设置的cookie
  header('Set-Cookie: '.$cookie, false, $this->statusCode);
 }

 // status
 // 最后发送个status
 header(sprintf('HTTP/%s %s %s', $this->version, $this->statusCode, $this->statusText), true, $this->statusCode);

 return $this;
}

// 发送响应内容 
public function sendContent()
{ 
 // 想笑吗 就是这么简单
 echo $this->content;

 return $this;
}
// 至此真的响应了客户端了

/**
 * Call the terminate method on any terminable middleware.
 *
 * @param IlluminateHttpRequest $request
 * @param IlluminateHttpResponse $response
 * @return void
 */
public function terminate($request, $response)
{ 
 // 调用实现了terminate方法的中间件
 $this->terminateMiddleware($request, $response);
 // 执行注册的callback
 $this->app->terminate();
}

public static function toResponse($request, $response)
{
 if ($response instanceof Responsable) {
  $response = $response->toResponse($request);
 }

 if ($response instanceof PsrResponseInterface) {
  $response = (new HttpFoundationFactory)->createResponse($response);
 } elseif ($response instanceof Model && $response->wasRecentlyCreated) {
  $response = new JsonResponse($response, 201);
 } elseif (! $response instanceof SymfonyResponse &&
    ($response instanceof Arrayable ||
    $response instanceof Jsonable ||
    $response instanceof ArrayObject ||
    $response instanceof JsonSerializable ||
    is_array($response))) {
  $response = new JsonResponse($response);
 } elseif (! $response instanceof SymfonyResponse) {
  $response = new Response($response);
 }

 if ($response->getStatusCode() === Response::HTTP_NOT_MODIFIED) {
  $response->setNotModified();
 }

 return $response->prepare($request);
}

<?php

namespace IlluminateContractsSupport;

interface Responsable
{
 /**
  * Create an HTTP response that represents the object.
  *
  * @param IlluminateHttpRequest $request
  * @return SymfonyComponentHttpFoundationResponse
  */
 // 接收$request参数
 // 返回Response对象
 public function toResponse($request);
}


// 下面我们在控制器中返回一个实现此接口的实例
// 要实现的逻辑: 接收一个订单id 根据订单状态生成不同的响应，返回给客户端

1 定义路由
Route::get('yylh/{order}', "AppHttpControllersDebugTestController@checkStatus");

2 创建响应
namespace AppResponses;

use AppModelsOrder;
use IlluminateContractsSupportResponsable;
use IlluminateHttpJsonResponse;

class OrderStatusRes implements Responsable
{
 protected $status;

 public function __construct(Order $order)
 {
  $this->status = $order->status;
 }

 public function toResponse($request)
 {
  if ($this->status) {
   // 订单以完成
   return new JsonResponse('order completed', 200);
  }
  // 订单未结算
  return view('needToCharge');
 }
}

3 创建控制器
<?php

namespace AppHttpControllersDebug;

use AppHttpControllersController;
use AppModelsOrder;
use AppResponsesOrderStatusRes;

class TestController extends Controller
{
 public function checkStatus(Order $order)
 {
  return new OrderStatusRes($order);
 }
}

// 进行访问测试
// http://homestead.test/yylh/1
// http://homestead.test/yylh/2
// 可以看到丧心病狂的我们 通过控制器中的一行代码 就实现了根据订单的不同状态回复了不同的响应
// 我想说什么你们应该已经知道了