CiviCRM Community Forums (archive)

I'm working to trigger some specific business logic based on the value of a custom Participation field.  Specifically, I want to save contacts into a particular group based on their answer to a question at registration.  This needs to work for online registrations and for manually created event participations.

I've tried doing this using hook_civicrm_post(), using some code like the this:

if ($objectName == 'Participant' && $op == 'create') {
    switch ($_REQUEST['custom_24']) {
        case 1:
            // do something
        break;

        case 2:
            // do something
        break;
           
        case 3:
            // do something
        break;
    }
}


Questions:

• Unfortunately, the name of the field is not always the same.  When an anonymous user creates an online registration, the field value is in $_REQUEST['custom_24'], but when an authenticated user creates a manual participation record, the field value is in $_REQUEST['custom_24-1'].  Not knowing all the possible ways this value could come in through $_REQUEST, I hesitate to rely on this method.
  
  
• Is accessing $_REQUEST directly the only (or best) way to get the value of the custom field that's been submitted?  By the time we get to civicrm_post, the value will have been saved, but I see it's not part of $objectRef.

I suspect the answer is somewhere under CRM/Custom, but I'm hoping to avoid a few hours of trial and error.

Thanks,
Allen