as JoeBengalen pointed out, you’ll have to store the instance in session.
something like this:
public static function getInstance() {
if (true === is_null($_SESSION['SingletonClass'])) {
echo "getInstance SINGLETON NEW Instance";
$_SESSION['SingletonClass'] = new self();
}
return $_SESSION['SingletonClass'];
}
Since you haven’t provided any specifics of your session handler, I just used the default PHP method, but I’m sure you can adapt it 