/**
* Answer an array of proxies that are sitting in front of this application.
* This method will only return a non-empty array if we have received and
* validated a Proxy Ticket.
*
* @return array
* @access public
* @since 6/25/09
*/
public static function getProxies()
{
phpCAS::_validateProxyExists();
return self::$_PHPCAS_CLIENT->getProxies();
}