how to get post request ?

[ghost]

i want to create simple contact-us form
i create i get method to render contact-us.twig using timber

and i add form with post method content 3 input (name , email,subject)
now i want to get requested data from form

$rr->post('store-contact-us', 'store_contact_us', function(){
	 // print_r($request);
	echo('<h1>post route</h1>');
  });

how to get this data ?