php - The website can't be logged in using mobile devices -

i'm constructing website in mobile version , it's www.example.com/m/ . , got problem can't login website using mobile devices(android, iphone, ipad).

however, works under following situation:

1. login website using mobile device on localhost
2. login website using laptop on localhost
3. login website using laptop on server

that's mean doesn't work when use mobile device login on server.

$dbcon = dbconnect::create();  $login = $_post['login']; $password = $_post['password'];  //================= loading member informations====================================  $sql = "select * members (phone = '$login' or email = '$login') , password = '$password' limit 1";  if ($result = mysqli_query($dbcon,$sql)) {    $rows_num = 0;                                             //record?    while($row = mysqli_fetch_array($result)) {     $rows_num++;        //================== member data ===================================================       $user_id = $row['id'];                             $display_name = (empty($row['display_name']))? $row['name'] : $row['display_name'];              $email = $row['email'];              $phone = $row['phone'];              $email_confirm = $row['email_confirm'];           $member_type = $row['member_type'];            if($email==$login){ $loginby = 'email'; }elseif($phone==$login){ $loginby = 'phone'; }       //==================================================================================      //================ remember me ================================     if($_post['remanber_me']=="on"){             setcookie("user_id",$user_id,time()+60*60*24*30);         setcookie("display_name",$display_name,time()+60*60*24*30);         setcookie("email",$email,time()+60*60*24*30);         setcookie("phone",$phone,time()+60*60*24*30);         setcookie("email_confirm",$email_confirm,time()+60*60*24*30);         setcookie("loginby",$loginby,time()+60*60*24*30);         setcookie("member_type",$member_type,time()+60*60*24*30);     }     //================================================================      //================= session==========     $_session['user_id'] = $user_id;     $_session['display_name'] = $display_name;       $_session['email'] = $email;           $_session['phone'] = $phone;           $_session['email_confirm'] = $email_confirm;      $_session['loginby'] = $loginby;     $_session['member_type'] = $member_type;       //===========================================      //======================== update last login time ===============================     $sql = "update members set last_login_time = now(), last_login_ip = '$ip' id = $user_id";     $dbcon->query($sql);     //====================================================================== } 

on abover script, can update user last login information. guess problem on sessions. however, have no idea how solve problem...

edit: when print_r($_session) , print_r($row) within while loop, has record. when script redirect index.php or other pages, it's still haven't logged in website.

also, when login www.example.com first, , go www.example.com/m/, can still keep login status...i can't login directly through www.example.com/m/..

alright...i found missed $_session variable..so should be:

$_session['user_id'] = $user_id; $_session['display_name'] = $display_name;   $_session['email'] = $email;       $_session['phone'] = $phone;       $_session['email_confirm'] = $email_confirm;  $_session['loginby'] = $loginby; $_session['member_type'] = $member_type;   $_session['action_time'] = time(); //the stuff missed 

so cause user logout automatically after has logged in system...

it careless mistake...i should remind myself not again...