page.tpl.php

<?php
    $cookie_name = "last_page";
    $actual_link = "http://$_SERVER[HTTP_HOST]$_SERVER[REQUEST_URI]";

    // If the cookies does not exist, it is created:
    if(!isset($_COOKIE[$cookie_name])) {
        setcookie($cookie_name, $actual_link, time() + (86400 * 30));
        echo "<br/>first visited<br/>";
    } else {
        // Check if the cookie -URL saved- is not equal to the current URL, and if the HTTP_REFERER is written from the address bar:
        if ($actual_link !== $_COOKIE[$cookie_name] and strlen($_SERVER["HTTP_REFERER"]) == 0){
            header("Location: " . $_COOKIE[$cookie_name]);
            // Update the cookie with the new URL:
            setcookie($cookie_name, $actual_link, time() + (86400 * 30));
            exit();
        }
    }
?>