Auth_OpenID_GenericConsumer::begin PHP Method

    function begin($service_endpoint)
    {
        $assoc = $this->_getAssociation($service_endpoint);
        $r = new Auth_OpenID_AuthRequest($service_endpoint, $assoc);
        $r->return_to_args[$this->openid1_nonce_query_arg_name] = Auth_OpenID_mkNonce();
        if ($r->message->isOpenID1()) {
            $r->return_to_args[$this->openid1_return_to_identifier_name] = $r->endpoint->claimed_id;
        }
        return $r;
    }