Online PHP editor | output for CBU3B

<?php interface ServerRequestInterface {} interface ResponseInterface {} interface MiddlewareInterface { public function __invoke(ServerRequestInterface $request, ResponseInterface $response, MiddlewareInterface $next = null): ResponseInterface; } $app = new class { public function pipe() {} }; $app->pipe(new class implements MiddlewareInterface { public function __invoke(ServerRequestInterface $request, ResponseInterface $response, MiddlewareInterface $next = null): ResponseInterface { return $response; } });