Auth_OpenID_CheckAuthRequest::answer PHP Method

    function answer($signatory)
    {
        $is_valid = $signatory->verify($this->assoc_handle, $this->signed);
        // Now invalidate that assoc_handle so it this checkAuth
        // message cannot be replayed.
        $signatory->invalidate($this->assoc_handle, true);
        $response = new Auth_OpenID_ServerResponse($this);
        $response->fields->setArg(Auth_OpenID_OPENID_NS, 'is_valid', $is_valid ? "true" : "false");
        if ($this->invalidate_handle) {
            $assoc = $signatory->getAssociation($this->invalidate_handle, false);
            if (!$assoc) {
                $response->fields->setArg(Auth_OpenID_OPENID_NS, 'invalidate_handle', $this->invalidate_handle);
            }
        }
        return $response;
    }