列表判断栏目从二级到三级

<dd>

<? 

if (strlen($CN) == 4) {

$query=$db->query("select * from ".$LG->table("arclass")." where menunumber like '".substr($CN,0,4)."%' and level=2 order by sortnum desc,id desc limit 10");

}else{

$query=$db->query("select * from ".$LG->table("arclass")." where menunumber like '".$CN."%' and level=3 order by sortnum desc,id desc limit 10");

} 

while($rs=$db->fetchrow($query)){

?>

<a href="<? echo getcurl($rs["id"]);?>"><? echo $rs["menuname"];?></a>

<? }?>

</dd>