????????<?php
????????
include??'conn.php';

function?getList($pid=0,&$result=array(),$spac=0)
{
????$spac=$spac+4;
????$sql="select?*?from?`catalog`?where?`pid`='$pid'";
????$res=??mysql_query($sql);
?????while($row=??mysql_fetch_assoc($res))
?????{
?????????$row['catalogname']=?str_repeat('&nbsp;',?$spac).'|--'.$row['catalogname'];
?????????$result[]=$row;
?????????getList($row['id'],$result,$spac);
?????}
????
?????return?$result;
}
?
function?displayCatalog($pid=0,$selected=0)
{?
????$rs=getList($pid);
??????$str.="<select?name='catalog'>";
foreach?($rs?as?$key=>$val)
{??$selectedstr='';
????if($val['id']==$selected){
????????$selectedstr="selected";
????}
????$str.="<option?".$selectedstr.">".$val['catalogname']."</option>";
}
$str.="</select>";
return?$str;
}

echo?displayCatalog(0,2);
echo?displayCatalog(0);?????????>