Denying access in sessions

[Anon]

I have set up some javascript tests online and am trying to use PHP and mySQL to collect the answers. After users take the test they are directed to a discussion of the answers. Once they get to the answers I need to disable the test page for their username and password. If they can just hit the back button after seeing the answers they can just change all of the answers on the test.

Can PHP do this. Or could I set up the database to only accept one answer per question no matter how many times they submit the test? Sorry but I am a newbee I just finished learning sessions when all of these new problems came up.

thanks.

[Anon]

Follow this steps:

page1.php

if (!$forum) {
session_start();
session_register(forum);
}
.
.
.

page2.php

session_start();

// You can setup $forum like it

$forum=my_forum
$sql=(insert into table ...);
.
.

session_unregister(forum);
session_destroy();

If the user try to reload the page in page2, in some cases he is not able to insert values in the database. In page.php he will create the session(forum);

Regards