- md5: documentation ( source)
<?php
$salt = 'df3f#sw.g';
$utm_source = 'unilead';
$utm_medium = 'affiliate';
$utm_campaign = 'test';
$utm_term = md5($utm_source.$utm_medium.$utm_campaign.$salt);
echo 'http://www.shop.laroche-posay.ru/?utm_source='.$utm_source.'&utm_medium='.$utm_medium.'&utm_campaign='.$utm_campaign.'&utm_term='.$utm_term;