Question

I know that second value after splitting __utma cookie is a visitor unique id. How can I obtain that in proper way? Something like this: var uid = _ga.visitor.getUid();

Answer 1

_gaq.push(function(){
  var tracker = _gat._getTrackers()[0];
  var visit_code = tracker._visitCode();

  console.log(visit_code);
});

UPDATE

_visitCode() is an undocumented method but it has been around for at least one year as far as I know. My guess is that Google will not get rid of it, since it’s concentrating it’s new efforts on implementing Universal Analytics that has a different approach.

The 2 options you have here is to either use this undocumented method or fiddle with a cookie that also has an undocumented format. So both are somewhat unreliable.

On the time of this posting Universal Analytics is still in beta.