public function get_former_activity_id($employees_id, $selected_date = null) { if (!tep_not_null($selected_date)) { $selected_date = time(); } $former_activity_id = activity::get_former_activity_id($employees_id, $selected_date); if ($former_activity_id <= 0) { // No activity exists or activity not valid for given employee & date $this->former_activity = null; } else { // Activity exists and is valid for given employee and date $this->former_activity = new activity($former_activity_id); } return $former_activity_id; }