I have created a Shopper Field In VM called "Preferred Currency" preferred_currency with 2 options:
1 - USD
2 - CAD

I have created a Chameleon Rule with some php which "should" accomplish this but it doesn't work

The PHP I have added is below. Can you make some suggestions?
JomGeniusClassVirtuemart::loadVmConfig();
$userModel = VmModel::getModel('user');
$userDetails = $userModel->getCurrentUser();
$userInfo = $userDetails->userInfo;
if (count($userInfo)) {
  if (end($userInfo)->preferred_currency == 2) {
    return true;
  } else {
    return false;
  }
  } else {
    return false;
  }

Can you help?

Cheers