Index.php

<?php

    //! Tradetracker Redirect-Page.

    // Set domain name on which the redirect-page runs, WITHOUT "www.".
    $domainName = ' HERE I PUT MY DOMAIN';

    // Set the P3P compact policy.
    header('P3P: CP="ALL PUR DSP CUR ADMi DEVi CONi OUR COR IND"');

    // Define parameters.
    $canRedirect = true;

    // Set parameters.
    if (isset($_GET['campaignID']))
    {
        $campaignID = $_GET['campaignID'];
        $materialID = isset($_GET['materialID']) ? $_GET['materialID'] : '';
        $affiliateID = isset($_GET['affiliateID']) ? $_GET['affiliateID'] : '';
        $redirectURL = isset($_GET['redirectURL']) ? $_GET['redirectURL'] : '';
        $reference = '';
    }
    else if (isset($_GET['tt']))
    {
        $trackingData = explode('_', $_GET['tt']);

        $campaignID = isset($trackingData[0]) ? $trackingData[0] : '';
        $materialID = isset($trackingData[1]) ? $trackingData[1] : '';
        $affiliateID = isset($trackingData[2]) ? $trackingData[2] : '';
        $reference = isset($trackingData[3]) ? $trackingData[3] : '';

        $redirectURL = isset($_GET['r']) ? $_GET['r'] : '';
    }
    else
        $canRedirect = false;

    if ($canRedirect)
    {
        // Calculate MD5 checksum.
        $checkSum = md5('CHK_' . $campaignID . '::' . $materialID . '::' . $affiliateID . '::' . $reference);

        // Set session/cookie arguments.
        $cookieName = 'TT2_' . $campaignID;
        $cookieValue = $materialID . '::' . $affiliateID . '::' . $reference . '::' . $checkSum . '::' . time();

        // Create tracking cookie.
        setcookie($cookieName, $cookieValue, (time() + 31536000), '/', !empty($domainName) ? '.' . $domainName : null);

        // Create tracking session.
        session_start();

        // Set session data.
        $_SESSION[$cookieName] = $cookieValue;

        // Set track-back URL.
        $trackBackURL = 'http://tc.tradetracker.net/?c=' . $campaignID . '&m=' . $materialID . '&a=' . $affiliateID . '&r=' . urlencode($reference) . '&u=' . urlencode($redirectURL);

        // Redirect to TradeTracker.
        header('Location: ' . $trackBackURL, true, 301);
    }

?>