public static function addTracking($url, $utm_data = array())
{
$utm_defaults = array('source' => 'pvlive', 'medium' => 'direct', 'campaign' => 'pvlive', 'term' => NULL, 'content' => NULL);
$utm_data = array_merge($utm_defaults, $utm_data);
$url_parts = Utilities::parseUrl($url);
$url_params = (array) $url_parts['query_arr'];
foreach ($utm_data as $utm_key => $utm_val) {
if (!empty($utm_val)) {
$url_params['utm_' . $utm_key] = $utm_val;
}
}
$url_parts['query'] = http_build_query($url_params);
return Utilities::buildUrl($url_parts);
}
