Finally, I figured out how to solve my problem:
class Import_Facebook_Events_Facebook_Ext extends Import_Facebook_Events_Facebook {
function get_location( $facebook_event ) {
if ( !isset( $facebook_event->place->id ) ) {
$facebook_event->place->id = '';
//return null;
}
//other code here
return $event_location;
}
}
$new_ife_events = run_import_facebook_events();
$new_ife_events->facebook = new Import_Facebook_Events_Facebook_Ext();
A question: the last two code lines must be included in a function/action?