$sql=
"select MAX(id) AS maxid from dangxiao_zichan_guzi_2_cg_5 where zhangtao='"
.$_SESSION['mdaima_zhangtao
']."'
";//最后一行数据的判断标记
$result=$mysqli->query($sql);
if($rs=$result->fetch_assoc()){
$maxid=$rs[
"maxid"
];
}