Question

I’m able to create and delete events, but haven’t found where to post follow-up comments to events.

So, is it even possible to post a comment to an existing event, created by my application, using php-sdk?

Answer 1

I am assuming that you meant “make a post on a event wall” because you can not comment events in Facebook. You can use the PHP SDK (see on github) to make any call on the graph API, including posting on an event wall.

You need for that the access token of your application (see how to get it in the Facebook reference) and the ID of the event (EVENT_ID). And then :

require "facebook.php";
$facebook = new Facebook(
  'appId'  => YOUR_APP_ID,
  'secret' => YOUR_APP_SECRET,
);

$facebook->setAccessToken(YOUR_APP_TOKEN);

$args['message'] = "Hello world !";
$facebook->api('/EVENT_ID/feed', $args);

More on publishing post in the Facebook graph API Documentation.

Hope that helps !