public function remove_participant_from_cart()
 {
     $id = CRM_Utils_Request::retrieve('id', 'Integer');
     $participant = CRM_Event_Cart_BAO_MerParticipant::get_by_id($id);
     $participant->delete();
     CRM_Utils_System::civiExit();
 }
 function remove_participant_from_cart()
 {
     $participant = CRM_Event_Cart_BAO_MerParticipant::get_by_id($_GET['id']);
     $participant->delete();
     CRM_Utils_System::civiExit();
 }