在没有 javascript 的情况下防止页面刷新后变量更新

Question

A friend of mine is developing a web application that's more of an online learning facility. On each page is a set of questions. He wants that when the use has answered all the questions on a page and submitted (and taken to the next page for the next set of questions), he shouldn't be able to go back to answer and resubmit those questions again. The idea is that "opportunity comes but once".

He doesn't want to use javascript because it can be disabled which leaves him with server-side coding. He uses PHP.

Is there a solution?

Answer 1

Maybe use sessions ? This 'feature' can be really are handy when you want data persistance.

There is also the option of using hidden fields to pass the value but in my humble opinion sessions are cleaner.

Answer 2

Unless you want to use some sort of database, the easiest way would be to set cookies for the user with PHP. You'd store which questions have already been answered and check that cookie server-side.