php - Slim 框架给出了一个令人困惑的未捕获类型错误
问题描述
我刚刚使用我自己的设置通过 composer 安装了一个全新的 slim 副本。非常简单的 index.php,其中包含的内容很少:
<?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 TypeError:传递给 {closure}() 的参数 2 必须是 Psr\Http\Message\ResponseInterface 的实例,给定的 Slim\Routing\RouteRunner 的实例,在 /var/www/vendor/slim/ 中调用slim/Slim/MiddlewareDispatcher.php 在第 275 行并在 /var/www/public/index.php:16 中定义堆栈跟踪:#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,而我明确给出了 Psr\Http\Message\ResponseInterface
任何的想法?
编辑:
感谢delboy的回答,但你能更具体一点吗?纤薄的文档显示可以像这样使用它(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?
他们给出的这个示例代码还会产生另一个奇怪的错误:
Fatal error: Uncaught ArgumentCountError: Too few arguments to function {closure}(), 2 passed in /var/www/vendor/slim/slim/Slim/MiddlewareDispatcher.php on line 275 and exactly 3 expected in /var/www/public/index.php:26 Stack trace: #0 /var/www/vendor/slim/slim/Slim/MiddlewareDispatcher.php(275): {closure}(Object(Slim\Psr7\Request), Object(class@anonymous)) #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(38): Slim\App->run() #5 {main} thrown in /var/www/public/index.php on line 26
我的示例代码传递了 3 个参数,而不是 2 个!
编辑:
好的,Slim 文档显然已经过时了,应该这样做:
$app->add(function(ServerRequestInterface $request, RequestHandlerInterface $handler) {
$response = new Response();
$response->getBody()->write('STUFF');
return $response;
});
解决方案
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;
/**
* Participant in processing a server request and response.
*
* An HTTP middleware component participates in processing an HTTP message:
* by acting on the request, generating the response, or forwarding the
* request to a subsequent middleware and possibly acting on its response.
*/
interface MiddlewareInterface
{
/**
* Process an incoming server request.
*
* Processes an incoming server request in order to produce a response.
* If unable to produce the response itself, it may delegate to the provided
* request handler to do so.
*/
public function process(ServerRequestInterface $request, RequestHandlerInterface $handler): ResponseInterface;
}
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