如以下代码，数据库是整型，bigint/smallint，读取数据后不强制转换的话，就是字符型
$re=null;
$user=M('User');
$userData=$user->where('user_id=%d',session('UID'))->select();
if($userData){
$re['user_status']=$userData[0]['user_status'];
$re['ug_id']=$userData[0]['ug_id'];
}
dump($re);
---------------------------------------------------------------
array(2) {
["user_status"] => string(1) "1"
["ug_id"] => string(2) "-1"
}