php封装的mongodb操作类代码

$table_name=trim(strtolower($this->table_name));
$this->mongo_db->where($where);
$order=!emptyempty($order)?array('AID'=>'DESC'):array('AID'=>'ASC');//升序降序
$infos=$this->mongo_db->listinfo($table_name,$order,$page,$pagesize);