session and back button problem

[Anon]

Hi,

In ASP you can prevent a user from using the back button, in order to vistit a page that requires logon, by writing:

Response.Buffer = True
Response.ExpiresAbsolute = Now() - 1
Response.Expires = 0
Response.CacheControl = no-cache

Is there something similar to this in PHP?

I've tried to unset my login session with
unset($_SESSION['name']; but if I click the back button I can still view the page. I'd like the 'page is no longer valid'-page to show instead...

Thanks

[theslinky]

Try this:

<?php
//sets expires to date in the past, last modified to current time
header ("Expires: Mon, 26 Jul 1997 05:00:00 GMT");
header ("Last-Modified: " . gmdate("D, d M Y H:i:s") . " GMT");
header ("Cache-Control: no-cache"); // HTTP/1.1
header ("Pragma: no-cache"); // HTTP/1.0
?>

I think the above should do the trick.

[Anon]

it worked, thank you Sridhar!