PiwikTracker::setUrlReferrer PHP Method

    public function setUrlReferrer($url)
    {
        $this->urlReferrer = $url;
        return $this;
    }

<?php

include '../../includes/config.php';
require_once '../../includes/PiwikTracker.php';
PiwikTracker::$URL = get_page_url('stats', $CONF) . '/piwik.php';
$fileURL = $_GET['file'];
$file_db = $db->select('uploads', "url=? LIMIT 1", array($fileURL));
$file_path = $CONF['upload_dir'] . $file_db['filename'];
$temp_path = sys_get_temp_dir() . "\\" . $file_db['filename'];
if (file_exists($file_path) && $file_db) {
    $t = new PiwikTracker($idSite = 1);
    $t->setUserAgent($_SERVER['HTTP_USER_AGENT']);
    $t->setUrlReferrer($_SERVER['HTTP_REFERER']);
    $t->setUrl($url = get_page_url('u', $CONF) . '/' . $fileURL);
    $t->doTrackPageView('Teknik Upload - ' . $fileURL);
    if ($file_db['hash'] != "") {
        $crypt = new Cryptography();
        $result = $crypt->Decrypt($CONF['key'], $file_db['hash'], $file_path, $temp_path, $file_db['cipher']);
        if ($result) {
            $file_path = $temp_path;
        }
    }
    $file_type = $file_db['type'];
    $pattern = "/^((image)|(text)|(audio)|(video))\\/(.*)\$/";
    if (!preg_match($pattern, $file_type)) {
        header("Content-Disposition: attachment; filename=\"" . $file_db['filename'] . "\"");
        header("Pragma: public");
        header("Cache-Control: must-revalidate, post-check=0, pre-check=0");
        header('Content-Type: ' . $file_type);
        header('Content-Length: ' . $file_db['filesize']);
        set_time_limit(0);