Affiliates + MP + Multisite

affiliates.php

add_action( 'wp_footer', function(){

  if( isset( $_COOKIE['affiliate_' . COOKIEHASH] ) ) { 
    $reference = isset($_GET['ref'])?$_GET['ref']:false;

      @setcookie('affiliate_' . COOKIEHASH, 'aff' . md5(AUTH_SALT . $reference),
          (time() + (60 * 60 * 24 * ((int) AFFILIATE_COOKIE_DAYS ))),
          COOKIEPATH,
          COOKIE_DOMAIN
          );
  }
}) ;