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;
}
