- array_slice: documentation ( source)
- implode: documentation ( source)
- explode: documentation ( source)
<?php
$url_referer= 'http://www.jornaiserevistas.com/noticias.php?URLID=verao20111012716053647';
$urlCampaign= implode('/', array_slice(explode('/', $url_referer), 0, 3)) . '/';
echo $urlCampaign;
?>