Slim 框架提供了一个令人困惑的未捕获类型错误

Question

我刚刚使用我自己的设置通过 composer 安装了一个新的 slim 副本。非常简单的 index.php，里面的内容很少：

<?php

use Psr\Http\Message\ResponseInterface as Response;

use Psr\Http\Message\ServerRequestInterface as Request;

use Slim\Factory\AppFactory;

require_once __DIR__ . '/../bootstrap.php';

// start the app

$APP = AppFactory::create();

/**

 * Middleware to check validation before any routes

 */

$APP->add(function(Request $request, Response $response, callable $next){

    $response = $next($request,$response);

    return $response;

});

/**

 * Add routes

 */

$APP->get('/test',function(Request $request, Response $response, array $args){

    return $response->getBody()->write('hello');

});

// run the app

$APP->run();

PHP给出了一个非常奇怪的错误：

**致命错误：未捕获的类型错误：传递给 {closure}() 的参数 2 必须是 Psr\Http\Message\ResponseInterface 的实例，给出的 Slim\Routing\RouteRunner 实例，在 /var/www/vendor/slim/ 中调用slim/Slim/MiddlewareDispatcher.php 位于第 275 行，定义在 /var/www/public/index.php:16 堆栈跟踪：#0 /var/www/vendor/slim/slim/Slim/MiddlewareDispatcher.php(275)： {closure}（对象（Slim\Psr7\Request），对象（Slim\Routing\RouteRunner））

1 /var/www/vendor/slim/slim/Slim/MiddlewareDispatcher.php(73): class@anonymous->handle(Object(Slim\Psr7\Request)) #2

/var/www/vendor/slim/slim/Slim/App.php(206): Slim\MiddlewareDispatcher->handle(Object(Slim\Psr7\Request)) #3 /var/www/vendor/slim/slim/Slim /App.php(190): Slim\App->handle(Object(Slim\Psr7\Request)) #4 /var/www/public/index.php(34): Slim\App->run() #5 {main} 在第 16 行的 /var/www/public/index.php 中抛出**

我不明白为什么它说这里的基本中间件正在使用 Slim\Routing\RouteRunner 的实例，而我显然给了它 Psr\Http\Message\ResponseInterface

任何的想法？

编辑：

感谢delboy的回答，但你能更具体点吗？苗条的文档显示像这样使用它（http://www.slimframework.com/docs/v3/concepts/middleware.html）：

$app->add(function ($request, $response, $next) {

    $response->getBody()->write('BEFORE');

    $response = $next($request, $response);

    $response->getBody()->write('AFTER');

    return $response;

});

但这不起作用！总是得到类型错误，那么他们的文档是否过时了？如果是这样，我如何在这里实现中间件？

我的示例代码传递了 3 个参数，而不是 2 个！

Answer 1

您的中间件没有实现 PSR-15。您不应该传递响应，而是传递请求处理程序接口：namespace Psr\Http\Server;use Psr\Http\Message\ResponseInterface;use Psr\Http\Message\ServerRequestInterface;/**&nbsp;* Participant in processing a server request and response.&nbsp;*&nbsp;* An HTTP middleware component participates in processing an HTTP message:&nbsp;* by acting on the request, generating the response, or forwarding the&nbsp;* request to a subsequent middleware and possibly acting on its response.&nbsp;*/interface MiddlewareInterface{&nbsp; &nbsp; /**&nbsp; &nbsp; &nbsp;* Process an incoming server request.&nbsp; &nbsp; &nbsp;*&nbsp; &nbsp; &nbsp;* Processes an incoming server request in order to produce a response.&nbsp; &nbsp; &nbsp;* If unable to produce the response itself, it may delegate to the provided&nbsp; &nbsp; &nbsp;* request handler to do so.&nbsp; &nbsp; &nbsp;*/&nbsp; &nbsp; public function process(ServerRequestInterface $request, RequestHandlerInterface $handler): ResponseInterface;}https://www.php-fig.org/psr/psr-15/

Answer 2

需要添加：使用Slim\Psr7\Response；

Answer 3

首先，您需要检查您使用的是哪个超薄版本，当我开始学习时，我也遇到了这个错误/问题，但您想解决这个问题，您可以在您的代码中进行此编辑。$APP = AppFactory::create();$app->setBasePath("/myapp/public/index.php");$APP->add(function(Request $request, Response $response, callable $next){&nbsp; &nbsp; $response = $next($request,$response);&nbsp; &nbsp; return $response;});