class Tool {
  static public $treeList = array(); //存放无限分类结果如果一页面有多个无限分类可以使用 Tool::$treeList = array(); 清空
  /**
   * 无限级分类
   * @access public 
   * @param Array $data   //数据库里获取的结果集 
   * @param Int $pid       
   * @param Int $count    //第几级分类
   * @return Array $treeList  
   */
  static public function tree(&$data,$pid = 0,$count = 1) {
    foreach ($data as $key => $value){
      if($value['Pid']==$pid){
        $value['Count'] = $count;
        self::$treeList []=$value;
        unset($data[$key]);
        self::tree($data,$value['Id'],$count+1);
      } 
    }
    return self::$treeList ;
  }  
}