Google Calendar PHP - Event URL / ID? (Zend_Gdata) - php

Question

I have modified my PHP web app to add events to a Google Calendar. Currently, it adds successfully.
However, now I wish to delete and edit events. This seems easy to do, except for the fact that I don't know what event URL is associated with each event.
Am I supposed to set this event URL (or ID?) upon adding an event? How am I supposed to figure out what it is?
I can't seem to find this information anywhere else...
Thanks!
EDIT:
I have been using the Zend Framework for this (Gdata package)...
EDIT:
$newIncludePath = array();
$newIncludePath[] = '../ZendGdata-1.8.4PL1/library';
$newIncludePath = implode($newIncludePath);
set_include_path($newIncludePath);
// load classes
require_once 'Zend/Loader.php';
Zend_Loader::loadClass('Zend_Gdata');
Zend_Loader::loadClass('Zend_Gdata_ClientLogin');
Zend_Loader::loadClass('Zend_Gdata_Calendar');
Zend_Loader::loadClass('Zend_Http_Client');
// connect to service
$gcal = Zend_Gdata_Calendar::AUTH_SERVICE_NAME;
$user = "********#gmail.com";
$pass = "*****";
$client = Zend_Gdata_ClientLogin::getHttpClient($user, $pass, $gcal);
$gcal = new Zend_Gdata_Calendar($client);
// construct event object
// save to server
try {
$event = $gcal->newEventEntry();
$event->title = $gcal->newTitle($title);
$event->content = $gcal->newContent($desc);
$when = $gcal->newWhen();
$when->startTime = $date;
$when->endTime = $date;
$event->when = array($when);
$gcal->insertEvent($event);
echo $event->getEditLink()->href;
} catch (Zend_Gdata_App_Exception $e) {
echo "Error: Unable to add event to Google Calendar" . $e->getResponse();
}

Answer 1

This is plainly documented in the Zend_Gdata documentation:
http://framework.zend.com/manual/en/zend.gdata.calendar.html#zend.gdata.calendar.deleting_events
// Option 1: Events can be deleted directly
$event->delete();
or
// Option 2: Events can be deleted supplying the edit URL of the event
// to the calendar service, if known
$service->delete($event->getEditLink()->href);
It sounds like you need the latter.
Edit:
Get the edit link from your $event. It's shown in the code above:
$event->getEditLink()->href;
This will be available on a saved event. e.g.
$newEvent = $service->insertEvent($event);
echo $newEvent->getEditLink()->href;

Answer 2

You could have a look at Zend_Gdata and Zend_Gdata_Calendar : those would probably help for all the hard work -- and if you don't have to spend code to communicate with Google's API, it gives you more time to develop other things ;-)
And it seems it can be used outsid of the Zend FRamework : it's even available as a standalone download : http://framework.zend.com/download/gdata
(If you really want to do it yourself, you can still try to understand how Zend_Gdata does it ^^ )

Answer 3

Here's a GREAT resource to help you with this:
Integrate your PHP application with Google Calendar
Here's how I obtain the unique ID of the calendar event after publishing the event with newEventEntry. I store the $id value in the database, in case I have to edit it later with update or delete.
try {
$event = $gcal->newEventEntry();
$event->title = $gcal->newTitle($title);
$when = $gcal->newWhen();
$when->startTime = $start;
$when->endTime = $end;
$event->when = array($when);
$gcal->insertEvent($event);
$id = substr($event->id, strrpos($event->id, '/')+1); // trim off everything but the id
} catch (Zend_Gdata_App_Exception $e) {
echo "Error: " . $e->getResponse();
}
// Do mysql Insert functions here to store the record in db (removed for clarity)
echo 'Event '. $id. 'successfully added!';
Then, when I need to access that particular event I can use it to target just that event for updating/deleting using a $_POST of the ID:
try {
$event = $gcal->getCalendarEventEntry('http://www.google.com/calendar/feeds/default/private/full/' . $_POST['id']);
$event->title = $gcal->newTitle($title);
$when = $gcal->newWhen();
$when->startTime = $start;
$when->endTime = $end;
$event->when = array($when);
$event->save();
} catch (Zend_Gdata_App_Exception $e) {
die("Error: " . $e->getResponse());
}
echo 'Event successfully modified!';
Hope this answers your question - I struggled with getting this working, but share my findings with you here, if it helps I'm happy to have assisted.
Scott

Answer 4

Well if you dont want to store event ids in local database, here another good way to deleting event if you have infomration about start time, end time and calendar id(specific calendar for which you want to delete event between start time and end time)
function deleteEvent($client,$startDate,$endDate,$startTime,$endTime,$tzOffset,$cal_id)
{
$gdataCal = new Zend_Gdata_Calendar($client);
$query = $gdataCal->newEventQuery();
$query->setUser($cal_id);
$query->setVisibility('private');
$query->setProjection('full');
$query->setOrderby('starttime');
$query->setStartMin("{$startDate}T{$startTime}:00.000{$tzOffset}");
$query->setStartMax("{$endDate}T{$endTime}:00.000{$tzOffset}");
$eventFeed = $gdataCal->getCalendarEventFeed($query);
foreach ($eventFeed as $event) {
$event->delete();
}
}
Hope it helps to somebody, like it did to me.