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#ask-questions
Title
# ask-questions
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orange-train-515

10/26/2021, 7:08 PM
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?
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fresh-football-47124

10/26/2021, 7:09 PM
we use persistent hashing
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future-teacher-7046

10/26/2021, 7:10 PM
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.
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orange-train-515

10/26/2021, 7:13 PM
Great, thanks!
Which means the user can't be assigned to both groups of the same experiment?
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future-teacher-7046

10/26/2021, 7:14 PM
correct
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