我在把__invoke($request, $reaponse, callable $next) 升级PSR-15 接口实现时，发现个问题，比如升级前的代码:

class TestMiddleware {
  public function __invoke($request, $reaponse, callable $next)
{
    if (someInvalid($request)) {
        return $response->withStatus (403);
    }
    
    return $next($request, $response);
  }
}

升级后，没有 response 参数，我就得去依赖实现好的应用库

composer require zendframework/zend-diactoros 

class TestMiddleware implements MiddlewareInterface {
  public function process(ServerRequestInterface $request, RequestHandlerInterface $handler): ResponseInterface {
if (someInvalid($request)) {
        return (new Response ())->withStatus (403);
    }
    
    return $next($request, $response);
  }
}

这样多了个 psr/http-message 实现的依赖，感觉更麻烦了些。