Prevent back button after logout

by

Implement this in PHP and not javascript.

At the top of each page, check to see if the user is logged in. If not, they should be redirected to a login page:

<?php 
      if(!isset($_SESSION['logged_in'])) : 
      header("Location: login.php");  
?>

As you mentioned, on logout, simply unset the logged_in session variable, and destroy the session:

<?php
      unset($_SESSION['logged_in']);  
      session_destroy();  
?>

If the user clicks back now, no logged_in session variable will be available, and the page will not load.

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