use Symfony\Component\HttpFoundation\Request; use Symfony\Component\HttpFoundation\Response; $request = Request::createFromGlobals(); if ($request->getMethod() == 'POST' && $request->isSubmitted()) { // Form has been submitted // Do something with submitted data $data = $request->request->all(); } $response = new Response(); $response->setContent('Hello, World!'); $response->send();In this example, the Symfony HttpFoundation package library is used to handle form submissions. The isSubmitted function is called on the request object to check if the form has been submitted. If it has, the submitted data is retrieved and stored in the $data variable. The form submission is then handled and a response is sent back to the user.