You can insert this code fragment at the beginning of each page where you want to monitor the user session.

<?php
session_start(); //Initialise the session
// Assign a variable to the username captured in the session
$username2 = $_SESSION['username']; 

//Check whether the session username is empty
if ($_SESSION['username'] == "") 
{ //If it is empty, then redirect the user to the index page
    header("Location:index.php");
}
?>
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