$conn = new mysqli("localhost", "root", "", "mydb");

    if (isset($_POST['btn_saves'])) {
        session_start();
        $checkUser = $conn->query("SELECT * from team WHERE username = '$_POST[username]' AND password = '$_POST[password]'");


        if ($checkUser->num_rows > 0) {
            $_SESSION['temp'] = "true";
            $user = $checkUser->fetch_assoc();
            $user_type = $checkUser->fetch_assoc();
            $_SESSION['user_id'] = $user['user_id'];

        } else if ($checkUser->num_rows == 1) {

            $logged_in_user = mysqli_fetch_assoc($results);
                if ($logged_in_user['user_type'] == 'admin') {

                    $_SESSION['user_id'] = $logged_in_user;
                    header('location: admin_panel.php');
                }else{
                    $_SESSION['user_id'] = $logged_in_user;

                    header('location: user_panel.php');
                }
        }

        else{
            echo "<script>alert('error')</script>";
        }
    }