无限级分类列表

<?php
header("Content-type: text/html; charset=utf-8");
$arr = array(
    0=>array('Id'=>1,'Name'=>'文件管理','Pid'=>0),
    1=>array('Id'=>2,'Name'=>'来源管理','Pid'=>0),
    2=>array('Id'=>3,'Name'=>'文件添加','Pid'=>1),
    3=>array('Id'=>4,'Name'=>'文件删除','Pid'=>1),
    4=>array('Id'=>5,'Name'=>'人员列表','Pid'=>2),
    5=>array('Id'=>6,'Name'=>'添加用户','Pid'=>5),
    6=>array('Id'=>7,'Name'=>'编辑用户','Pid'=>5),
);

function getTree($arr, $pid=0,$deep=0)
{
    static $tree = array();
    foreach($arr as $k=>$row)
    {
        if( $row['Pid'] == $pid )
        {
            $row['deep'] = $deep;
            $tree[] = $row;
            unset($arr[$k]);
            getTree($arr,$row['Id'],$deep+1);
        }
    }
    return $tree;
}

$res = getTree($arr);
echo "<pre>";
print_r($res);

运行结果：