php中无限级分类程序代码

--
-- 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");
    }
}
?>
<form id="form1" name="form1" method="post" action="?act=add">
  <table width="327" border="1" cellpadding="0" cellspacing="0">
    <tr>
      <td width="97" height="27">名称</td>
      <td width="224"><label for="name"></label>
      <input type="text" name="name" id="name" /></td>
    </tr>
    <tr>
      <td height="30">栏目</td>
      <td><select name="pid" id="pid">
            <option value="0">-----顶级分类-----</option>
            <?php
             sort_s(0);
   ?>
      </select></td>
    </tr>
    <tr>
      <td height="35">&nbsp;</td>
      <td><input type="submit" name="button" id="button" value="提交" /></td>
    </tr>
  </table>
</form>
<br />
<br />
<br />
<br />

<?php
//$sql = "select * from `class` order by sort asc, id Desc";
//$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'].'<br>';
        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);
    $n = str_replace("-","&nbsp;&nbsp;&nbsp;&nbsp;",$n);
 //print_r($row).'<br>';
    if($row['pid']==0){
       echo $n.'|-----'.$row['name'].'-----|<br>';
    }else{
       echo $n.'&nbsp;&nbsp;&nbsp;&nbsp;<font color="#FF0000">|-</font>'.$row['name'].'<br>';
       }
    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);
    $n = str_replace("-","&nbsp;&nbsp;&nbsp;&nbsp;",$n);
 //print_r($row).'<br>';
    if($row['pid']==0){
        echo "<option value="".$row['id']."" style='background:#ccc' >".$n.'|------'.$row['name']."-----|</option>rn";
    }else{
        echo "<option value="".$row['id']."">".$n.'&nbsp;&nbsp;&nbsp;&nbsp;|- '.$row['name']."</option>rn";
    }
    sort_s($row['id']);
 }
}
?>