A few users have had scenarios where they've wanted to solicit multiple, subsequent form submissions - in other words, have people submit the same form over and over with different information. To do this you'll need to use redirect success pages and add a bit of php code to make sure all the previously entered info is clear and a new php session is created.
On your SUCCESS page, simply go to the header of the page inspector and add this code:
// Initialize the session.
// If you are using session_name("something"), don't forget it now!
// Unset all of the session variables.
$_SESSION = array();