It's in the manual here:
It gives this solution
header ("Expires: Mon, 26 Jul 1997 05:00:00 GMT");
header ("Last-Modified: " . gmdate("D, d M Y H:i:s") . " GMT"); // always
header ("Cache-Control: no-cache, must-revalidate"); // HTTP/1.1
header ("Pragma: no-cache"); // HTTP/1.0
FoxJet, an ITW Company
----- Original Message -----
From: "Dhaval Desai" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Monday, September 10, 2001 12:31 PM
Subject: [PHP] Expire page...
> Well I would like to expire a page after you move away
> from that page and the user should not be able to hit
> the browser's back button and see the contents. I t
> should show that the page has expired..
> In ASp it is very easy to do that but in Php I am
> looking all over and still can't find it.
> Can anybody help me please...
> Thank You
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