PHP “Document Expired” after using the back button

Question

I have a form where I am filing some informations in a wizard. This page is reaching by POST and displayed with Smarty. Once I filed all the informations in, I am using anot

Answer 1

Everything is correct. When you push BACK on your Page 3 you are actually trying to go to previous page - this page is generated as a reply to bowser's POST request. To view this page new POST request should be sent and page would be generated relying on POST data.