$username = strip_tags($_POST['username']);
        $password = md5(strip_tags($_POST['password']));
        $email = strip_tags($_POST['email']);
        $bd = $_POST['birthday'];


if (isset($_POST["register"]));
{
        $dbCon->query("INSERT INTO users(username, password, email, birthday) Values('{$username}','{$password}','{$email}','{$bd}')");
}