ThinkPHP无限分类

1、新建一张表 id name pid path  插入几条数据

2、执行sql语句select id,name,pid,path,concat(path,'-',id) as bpath from think_cate order by bpath；

<form action="__URL__/add" method="post">
请选择父级栏目<select name="pid">
 <option value='0'>根栏目</option>
</select><br>
新的栏目名称：<input type="text" name="name"><br>
<input type="submit" value="添加栏目">
</form>

Action：

<?php

class CateAction extends Action {
	function index(){
		$Cate = D('Cate');

		$list = $Cate->field("id,name,pid,path,concat(path,'-',id) as bpath")->order('bpath')->select();

		foreach($list as $key=>$value){
		$list[$key]['count'] = count(explode('-',$value['bpath']));
		}
		$this->assign('list',$list);
		$this->display();
	}

	function add(){
		$cate = D('cate');
		if($vo=$cate->create()){
			if($cate->add()){
				$this->success('添加成功');
			}else{
				$this->error('添加失败');
			}
			//dump($vo);
		}else{
			$this->error($cate->getError());
		}
	}
}
?>

Model：

<?php

class CateModel extends Model {
 protected $_auto=array(
  array('path','tclm',3,'callback'),
 );

 function tclm(){
  $pid = isset($_POST['pid'])? (int)$_POST['pid']:0;
  if($pid==0){
   return 0;
  }
  $map['id'] = $pid;

//  echo $pid;

  $list=$this->where($map)->find();

  //dump($list);
  $data = $list['path'].'-'.$list['id'];

  return $data;
 }
}
?>

<form action="__URL__/add" method="post">
请选择父级栏目<select name="pid">

 <option value='0'>根栏目</option>
 <volist name='list' id="vo">
 <option value='{$vo["id"]}'>
  <php>
   for($i=0;$i<$vo['count'];$i++){
    echo '  ';
   }
  </php>
  {$vo['name']}
 </option>
 </volist>
</select><br>
新的栏目名称：<input type="text" name="name"><br>
<input type="submit" value="添加栏目">
</form>