HI. Just went through the documentation and didn't quite understand how to make the assigned user group persist through the entire experiment. Does the PHP library stores the user group to a storage of some sort?

we use persistent hashing

Hi Eugene, we use deterministic hashing to assign variations. That means, as long as the user_id and experiment key are the same, the user will always be assigned the same variation. No persistence or storage needed.

Great, thanks!

correct