if ($class_id != false)
$sql .= " AND class_id=".db_escape($class_id);
if ($parent == -1)
- $sql .= " AND parent <= 0";
+ $sql .= " AND (parent = '' OR parent = '-1')";
elseif ($parent != false)
$sql .= " AND parent=".db_escape($parent);
$sql .= " ORDER BY class_id, id, parent";