Piwik Image Tracker

<?php
//Set the id of your piwik site here
$idSite     = 1;
$token_auth = 'your user token here';
$img        = 'stat.png';

//Load Piwik Tracker
require_once 'PiwikTracker.php';

//Set the URL path to your Piwik Installation
$t          = new PiwikTracker($idSite, 'http://strainplumbing.com/piwik');

//Auth to allow for more API functions
$t->setTokenAuth($token_auth);

//Set correct IP (Should be users, not the web server issuing the request)
$t->setIp($_SERVER['REMOTE_ADDR']);

//Set referrer (if applicable)
if(isset($_SERVER['HTTP_REFERER']))
{
    $t->setUrl($_SERVER['HTTP_REFERER']);
}

$t->doTrackPageView('Strain Plumbing');

if(isset($_SERVER['HTTP_IF_MODIFIED_SINCE']) && strtotime($_SERVER['HTTP_IF_MODIFIED_SINCE']) == filemtime($img))
{
    header('Last-modified: '.date(DATERFC_1123, filemtime($img)), true, 304);
    exit;
}


//Set header
header('Content-Type: image/png');
header('Expires: '.date(DATE_RFC1123, time()+2592000));
header('Last-modified: '.date(DATE_RFC1123, filemtime($img)));

//Output image
echo file_get_contents($img);