Zend Gdata Calendar Event Update Not Sending Email Notification - zend-framework

Question

Although the following code snippet does successfully add additional guests to a google calendar event, it is not sending them email notifications of the event. Can someone tell me if it's possible to also send an email to the new guests?
$service = Zend_Gdata_Calendar::AUTH_SERVICE_NAME; // predefined service name for calendar
$client = Zend_Gdata_ClientLogin::getHttpClient($user, $pass, $service);
function sendInvite($eventId, $email)
{
$gdataCal = new Zend_Gdata_Calendar($client);
if($eventOld = $this->getEvent($eventId))
{
$who = $gdataCal->newwho();
$who->setEmail($email);
$eventOld->setWho(array_merge(array($who), $eventOld->getWho()));
try
{
$eventOld->save();
} catch(Zend_Gdata_App_Exception $e)
{
return false;
}
return true;
} else
return false;
}
function getEvent($eventId)
{
$gdataCal = new Zend_Gdata_Calendar($client);
$query = $gdataCal->newEventQuery();
$query->setUser('default');
$query->setVisibility('private');
$query->setProjection('full');
$query->setEvent($eventId);
try
{
$eventEntry = $gdataCal->getCalendarEventEntry($query);
return $eventEntry;
} catch(Zend_Gdata_App_Exception $e)
{
return null;
}
}

Answer 1

Finally figured it out.
public function sendInvite($eventId, $email)
{
$gdataCal = new Zend_Gdata_Calendar($this->client);
if($eventOld = $this->getEvent($eventId))
{
$SendEventNotifications = new Zend_Gdata_Calendar_Extension_SendEventNotifications();
$SendEventNotifications->setValue(true);
$eventOld->SendEventNotifications = $SendEventNotifications;
$who = $gdataCal->newwho();
$who->setEmail($email);
$eventOld->setWho(array_merge(array($who), $eventOld->getWho()));
try
{
$eventOld->save();
} catch(Zend_Gdata_App_Exception $e)
{
return false;
}
return true;
} else
return false;
}