Auth_OpenID_SuccessResponse::getSigned PHP Method

    function getSigned($ns_uri, $ns_key, $default = null)
    {
        // Return the specified signed field if available, otherwise
        // return default
        if ($this->isSigned($ns_uri, $ns_key)) {
            return $this->message->getArg($ns_uri, $ns_key, $default);
        } else {
            return $default;
        }
    }