function get_array($user_id,$top=0){
global $mysql,$_G;
  $sql = "select user_id as name from `{spreads_users}`  where p1.spreads_userid='{$user_id}'";
$rows= $mysql->db_fetch_arrays($sql);
  if($top==1){
  $arr[0]['name']=$user_id;
  $arr[0]['children']=array();
  }
  $top=$top+1;
foreach ($rows as $key=>$value)
 {
     $r = get_array($value['name']); //调用函数，传入参数，继续查询下级
     $arr[0]['children'][$key]['name']= $value['username']; //组合数组
      if(is_array($r)){
      $arr[0]['children'][$key]['children']= $r[0]['children'];
      }
      $i++;
    }
    return $arr;
  }
$list = get_array("1000",1); //调用函数1000是顶级ID
echo 'var data='.json_encode($list);

//$count为分类等级
sort_list($str,$fatherid,$count)
{
$rs = $this->sql->re_datas("select * from sort where father_id = fatherid");
$num = $this->sql->sql_numrows();
$i=0;
$n = 1;
while(isset($rs[$i]))
{
$name = "";
for($n = 1 ; $n < $count ; $n )
{
$name.="│ ";
}
if($i 1==$num)
{
$name.="└─".$rs[$i][name];
}
else
{
$name.="├─".$rs[$i][name];
}
if($rs[$i][isdir])
{
$str.="<span style='color:#CCCCCC'>".$name."</span>";
}
else
{
$str.=$name";
}
$temp = $count 1;
$str = $this->sort_list($str,$rs[$i][id],$temp);
$i ;
}
return $str;
}

$sort_list = sort_list($sort_list,0,1);

$categories = array(
  array('id'=>1,'name'=>'电脑','pid'=>0),
  array('id'=>2,'name'=>'手机','pid'=>0),
  array('id'=>3,'name'=>'笔记本','pid'=>1),
  array('id'=>4,'name'=>'台式机','pid'=>1),
  array('id'=>5,'name'=>'智能机','pid'=>2),
  array('id'=>6,'name'=>'功能机','pid'=>2),
  array('id'=>7,'name'=>'超级本','pid'=>3),
  array('id'=>8,'name'=>'游戏本','pid'=>3),
);

电脑
—笔记本
——-超级本
——-游戏本
—台式机
手机
—智能机
—功能机

array(
  //1对应id，方便直接读取
  1 => array(
    'id'=>1,
    'name'=>'电脑',
    'pid'=>0,
    children=>array(
      &array(
        'id'=>3,
        'name'=>'笔记本',
        'pid'=>1,
        'children'=>array(
          //此处省略
        )
      ),
      &array(
        'id'=>4,
        'name'=>'台式机',
        'pid'=>1,
        'children'=>array(
          //此处省略
        )
      ),
    )
  ),
  //其他分类省略
)

$tree = array();
//第一步，将分类id作为数组key,并创建children单元
foreach($categories as $category){
  $tree[$category['id']] = $category;
  $tree[$category['id']]['children'] = array();
}
//第二部，利用引用，将每个分类添加到父类children数组中，这样一次遍历即可形成树形结构。
foreach ($tree as $k=>$item) {
  if ($item['pid'] != 0) {
    $tree[$item['pid']]['children'][] = &$tree[$k];
  }
}

Array
(
  [1] => Array
    (
      [id] => 1
      [name] => 电脑
      [pid] => 0
      [children] => Array
        (
          [0] => Array
            (
              [id] => 3
              [name] => 笔记本
              [pid] => 1
              [children] => Array
                (
                  [0] => Array
                    (
                      [id] => 7
                      [name] => 超级本
                      [pid] => 3
                      [children] => Array
                        (
                        )
                    )
                  [1] => Array
                    (
                      [id] => 8
                      [name] => 游戏本
                      [pid] => 3
                      [children] => Array
                        (
                        )
                    )
                )
            )
          [1] => Array
            (
              [id] => 4
              [name] => 台式机
              [pid] => 1
              [children] => Array
                (
                )
            )
        )
    )
  [2] => Array
    (
      [id] => 2
      [name] => 手机
      [pid] => 0
      [children] => Array
        (
          [0] => Array
            (
              [id] => 5
              [name] => 智能机
              [pid] => 2
              [children] => Array
                (
                )
            )
          [1] => Array
            (
              [id] => 6
              [name] => 功能机
              [pid] => 2
              [children] => Array
                (
                )
            )
        )
    )
  [3] => Array
    (
      [id] => 3
      [name] => 笔记本
      [pid] => 1
      [children] => Array
        (
          [0] => Array
            (
              [id] => 7
              [name] => 超级本
              [pid] => 3
              [children] => Array
                (
                )
            )
          [1] => Array
            (
              [id] => 8
              [name] => 游戏本
              [pid] => 3
              [children] => Array
                (
                )
            )
        )
    )
  [4] => Array
    (
      [id] => 4
      [name] => 台式机
      [pid] => 1
      [children] => Array
        (
        )
    )
  [5] => Array
    (
      [id] => 5
      [name] => 智能机
      [pid] => 2
      [children] => Array
        (
        )
    )
  [6] => Array
    (
      [id] => 6
      [name] => 功能机
      [pid] => 2
      [children] => Array
        (
        )
    )
  [7] => Array
    (
      [id] => 7
      [name] => 超级本
      [pid] => 3
      [children] => Array
        (
        )
    )
  [8] => Array
    (
      [id] => 8
      [name] => 游戏本
      [pid] => 3
      [children] => Array
        (
        )
    )
)