php无限分级类

php无限分级类，网站栏目的无分级，以树形结构显示
/*使用递归方式遍历无限分级类*/
//必须获得顶级栏目
//加载数据库类
$ROOT = substr(dirname(__FILE__),0,-4);
include $ROOT.'/include/common.inc.php';
/*$dsql 为数据库类*/
$sql = "SELECT id,typename FROM dede_arctype where reid=0 ORDER BY id ASC";
$dsql->Execute('me',$sql);
$tpc = '';
while($row = $dsql->GetArray('me')){
$topc[$row['id']] = $row;
$topid[] = $row['id'];
blc($row['id'],null);
}

function blc($pid,$ppid)
{
global $dsql , $topc;
$rows = '';
$sql = "SELECT id,reid,typename FROM dede_arctype where reid=$pid ORDER BY id ASC";
$dsql->Execute('idme',$sql);

while($row = $dsql->GetArray('idme')){
$topc[$pid]['son'][$row['id']] = $row;
$topc[$ppid]['son'][$pid]['son'][$row['id']] = &$topc[$pid]['son'][$row['id']];
$rows[] = $row;
}

if($rows == '')
{
return;
}
else
{
foreach($rows as $varid){
blc($varid['id'],$varid['reid']);
}
return;
}

}
$topkey = array_keys($topc);
$toplength = count($topkey);

foreach($topid as $now_id)
{

for($i=0;$i {
if($topkey[$i] == $now_id) $reTOP[$topkey[$i]] = $topc[$topkey[$i]];
}
}
unset($topc);

$str = '';
function echotra($row){
global $str;
//if(empty($row['son'])) return;
foreach($row as $id=>$value){
$str .= '

';
echotra($value['son']);
$str .= '

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