plz help-logout code not working..

[smart@gayu]

<?
session_start();
unset($_SESSION['user']);
session_destroy();
echo "You have been successfully logged out.

<br><br>
You will now be returned to the login page.

<META HTTP-EQUIV=\"refresh\" content=\"2; URL=index.html\"> ";
?>


i wrote above code for logout.it works but prblm is if frm logout.php page which inturn shows index.html page i click on back button then it displys me the previous page.i dont no how to deal with this.plz help.and if i want the logout link on each page shld i add the above code to evry page?suggest me.
thanks in advance.

[sde]

seems like you need to add code to the previous page which redirects the user if they don't have a valid session, otherwise, depending how you coded it, it may keep the session alive.

PHP Code:

<?php
if (!$_SESSION['user']) {
  header("location: login.php");
  exit;
?>