Preventing from going to bak page.

[peacemaker]

Hi i am new to this forum,my problem is i need to know how can i prevent user from viewing back page again. Wats happening is , when user logout then i kill session with following functions

                session_start();
	session_unset('valid');
	session_destroy();

	setcookie('valid');

	header('Location:index.php');

but here the cookies and the session remain maintained. after this if user press back button , it should redirect to login page. Its not happening as the session remain maintained.

Can any one guide me plz , this is project is uploaded and giving me problem, so can any one help me out. Thanks .

i am giving my code for checking the validity of the session variable code as below

 

if(empty($_SESSION['valid']))
{
header('Location:index.php');
}
else
{	
remaining code for displaying text box for login
}

i want to check this code on every page so that user should not enter into the admin or the pmpage.

 

[MadTechie]

When the back button is used the browser loads the cached page

try this, to stop any cacheing

<?php
// Date in the past
header("Expires: Mon, 26 Jul 1997 05:00:00 GMT");
header("Cache-Control: no-cache");
header("Pragma: no-cache");
?>