php生成无限栏目树

$arr=Array(

  Array('cid'=> 2,'cname'=>'新闻','pid'=> 0),

  Array('cid'=> 4,'cname'=>'体育','pid'=> 0),

  Array('cid'=> 5,'cname'=>'娱乐','pid'=> 0),

  Array('cid'=> 7,'cname'=>'热点新闻','pid'=>2),

  Array('cid'=> 8,'cname'=>'小众新闻','pid'=> 2),

  Array('cid'=> 9,'cname'=>'民谣新闻','pid'=> 8),

);

<?php

$arr=Array(

  Array('cid'=> 2,'cname'=>'新闻','pid'=> 0),

  Array('cid'=> 4,'cname'=>'体育','pid'=> 0),

  Array('cid'=> 5,'cname'=>'娱乐','pid'=> 0),

  Array('cid'=> 7,'cname'=>'热点新闻','pid'=>2),

  Array('cid'=> 8,'cname'=>'小众新闻','pid'=> 2),

  Array('cid'=> 9,'cname'=>'民谣新闻','pid'=> 8),

);

functionformatTree($array,$pid= 0,$level= 1,$field=array('pid'=>'pid','id'=>'id','children'=>'children')){

    $arr=array();

    foreach($arrayas&$v) {

      if($v[$field['pid']] ==$pid) {

        $v['level'] =$level;

        $tem= formatTree($array,$v[$field['id']],$v['level']+1,$field);

        //判断是否存在子数组

        $tem&&$v[$field['children']] =$tem;

        $arr[] =$v;

      }

    }

    return$arr;

  }

$tree= formatTree($arr,0,1,$field=array('pid'=>'pid','id'=>'cid','children'=>'children') );

echo'

'

print_r($tree);

?>