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 ;
 

php
$link =mysql_connect('localhost','root','root');
mysql_select_db('tree');
mysql_query ( 'set names GBK' );
if($_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']);
 }
}
?>