function getLogin($conn){
if(isset($_POST['login']))
{
    $uid=$_POST['uid'];
    $pwd=$_POST['pwd'];

    $sql= "SELECT * FROM user WHERE uid='$uid' AND pwd ='$pwd'";
    $result=$conn->query($sql);
    if (mysqli_num_rows($result) == 1){
        if($row = $result->fetch_assoc()){

                $_SESSION['id'] = $row['id'];
                header("Location : index.php?loginsuccess");
                exit();
        }
    }
    else{



    }
}
}