Auth_OpenID_AX_FetchRequest::add PHP Method

    function add($attribute)
    {
        if ($this->contains($attribute->type_uri)) {
            return new Auth_OpenID_AX_Error(sprintf("The attribute %s has already been requested", $attribute->type_uri));
        }
        $this->requested_attributes[$attribute->type_uri] = $attribute;
        return true;
    }

 public function validateIdentifier($validator, $values, $arguments = array())
 {
     $authRequest = $this->getAuthAdapter()->getConsumer()->begin($values['openid_identifier']);
     if (!$authRequest) {
         throw new sfValidatorError($validator, 'Authentication error: not a valid OpenID.');
     }
     $sregExchange = new opOpenIDProfileExchange('sreg');
     $authRequest->addExtension(Auth_OpenID_SRegRequest::build(array(), $sregExchange->getImportSupportedProfiles()));
     // for OpenID1
     if ($authRequest->shouldSendRedirect()) {
         $values['redirect_url'] = $authRequest->redirectURL($arguments['realm'], $arguments['return_to']);
         if (Auth_OpenID::isFailure($values['redirect_url'])) {
             throw new sfValidatorError($validator, 'Could not redirect to the server: ' . $values['redirect_url']->message);
         }
     } else {
         $axExchange = new opOpenIDProfileExchange('ax');
         $axRequest = new Auth_OpenID_AX_FetchRequest();
         foreach ($axExchange->getImportSupportedProfiles() as $key => $value) {
             $axRequest->add(Auth_OpenID_AX_AttrInfo::make($value, 1, false, 'profile_' . $key));
         }
         $authRequest->addExtension($axRequest);
         $values['redirect_html'] = $authRequest->htmlMarkup($arguments['realm'], $arguments['return_to']);
         if (Auth_OpenID::isFailure($values['redirect_html'])) {
             throw new sfValidatorError($validator, 'Could not redirect to the server: ' . $values['redirect_html']->message);
         }
     }
     return $values;
 }