$app->post('/submit', function (Request $request) use ($app) { $name = $request->request->get('name'); $email = $request->request->get('email'); // Perform validation and save data // ... // Return response return new Response('Thanks for submitting your data!'); });In this example, we define a route `/submit` that will handle POST requests. Within the closure function, we use the `Request` object to fetch data submitted in the request body using the `get` method of the `Request` object's `request` property. We then perform any necessary validation and save the data. Finally, we return a `Response` object with a message. The Silex framework uses various Symfony components, such as HttpFoundation, Routing, and DependencyInjection, among others.