use Psr\Http\Message\ResponseInterface; use Psr\Http\Message\ServerRequestInterface; use Slim\Factory\AppFactory; require __DIR__ . '/vendor/autoload.php'; $app = AppFactory::create(); $app->get('/', function (ServerRequestInterface $request, ResponseInterface $response, $args) { $response->getBody()->write("Hello, world!"); return $response; }); $app->run();In the above example, we have used the Slim response package/library to create an HTTP response with a simple message "Hello, world!" and return it to the client. Other examples of using Slim response include setting headers, setting http status codes, and manipulating response bodies. Some of the classes and functions provided by the package/library include Response, ResponseFactory, ResponseInterface, and ResponseTrait. Overall, Slim response is a powerful package/library for working with HTTP responses in PHP and can be used to create clean and concise code that is easy to read and maintain.