php中无限级分类程序代码

--
-- 数据库: `tree`
--
CREATE DATABASE `tree` DEFAULT CHARACTER SET gb2312 COLLATE gb2312_chinese_ci;
USE `tree`;

--
-- 表的结构 `class`
--

CREATE TABLE `class` (
`id` int(11) NOT NULL auto_increment,
`name` varchar(10) NOT NULL,
`pid` int(11) NOT NULL,
`depth` varchar(100) default '0',
PRIMARY KEY (`id`)
) ENGINE=MyISAM DEFAULT CHARSET=gb2312 AUTO_INCREMENT=30 ;

$link =mysql_connect('localhost','root','root');
mysql_select_db('tree');
mysql_query ( 'set names GBK' );
if($_GET['act']=='add'){
$name=$_POST['name'];
if($name=='') exit('name not null');
$pid=$_POST['pid'];
if($pid !=0){
$sql="select * from class where id=".$pid;
$result =mysql_query($sql);
$row = mysql_fetch_array($result);
$depth=$row['depth'].','.mysql_insert_id();//$getID即为最后一条记录的ID
}else{
$depth=0;
}
$sql="INSERT INTO class(name,pid,depth) VALUES('".$name."','".$pid."','".$depth."')";
$result =mysql_query($sql);
if(!$result){
exit("shibai $sql");
}else{
exit("chenggong");
}
}
?>

//$sql = "select * from `class` order by sort asc, id Desc";
//$sql="select * from class where pid=0";
//$result =mysql_query($sql);
//while($row = mysql_fetch_array($result)){
//$class_arr[] = array($row['id'],$row['name'],$row['classid'],$row['sort']);
// echo $row['name'].$row['id'].'---'.$row['pid'].'
';
sorttree(0);


//}

function sorttree($id){
//if()
$sql="select * from class where pid=".$id;
$result =mysql_query($sql);
//$a=mysql_fetch_array($result);
//$row = mysql_fetch_array($result);
while($row = mysql_fetch_array($result)){
$rid=explode(",",$row['depth']);
$i=count($rid);
$n = str_pad('',$i,'-',STR_PAD_RIGHT);
$n = str_replace("-","    ",$n);
//print_r($row).'
';
if($row['pid']==0){
echo $n.'|-----'.$row['name'].'-----|
';
}else{
echo $n.'    |-'.$row['name'].'
';
}
sorttree($row['id']);
}
}

function sort_s($id){
//if()
$sql="select * from class where pid=".$id;
$result =mysql_query($sql);
//$a=mysql_fetch_array($result);
//$row = mysql_fetch_array($result);
while($row = mysql_fetch_array($result)){
$rid=explode(",",$row['depth']);
$i=count($rid);
$n = str_pad('',$i,'-',STR_PAD_RIGHT);
$n = str_replace("-","    ",$n);
//print_r($row).'
';
if($row['pid']==0){
echo "".$n.'|------'.$row['name']."-----|rn";
}else{
echo "".$n.'    |- '.$row['name']."rn";
}
sort_s($row['id']);
}
}
?>