栏目数组:

$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
$arr=Array(
  Array('cid' => 2,'cname' => '新闻','pid' => 0),
  Array('cid' => 4,'cname' =>'体育','pid' => 0),
  Array('cid' => 5,'cname' => '娱乐','pid' => 0),
  Array('cid' => 7,'cname' => '热点新闻','pid' =>2),
  Array('cid' => 8,'cname' => '小众新闻','pid' => 2),
  Array('cid' => 9,'cname' => '民谣新闻','pid' => 8),
);
function formatTree($array, $pid = 0,$level = 1,$field = array('pid'=>'pid','id'=>'id','children'=>'children')){
    $arr = array();
    foreach ($array as &$v) {
      if ($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 '<pre>';
print_r( $tree); 
?>　

我们有两个方法来进行软件设计：一个是让其足够的简单以至于让BUG无法藏身；另一个就是让其足够的复杂，让人找不到BUG。前者更难一些。

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