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If you want to fetch dynamic features from the GrowthBook server then your PHP config must be set up to perform HTTP fetching. (You'll also run into a similar issue if you want to fire any analytics tracking callbacks). However, if you are ok with pre-baked (permanent) feature definitions, you can manually set them in code: https://docs.growthbook.io/lib/php#withfeatures-method Alternatively (additionally?), you could look into front-end tests using JavaScript.

I want to use this for AB test

Typically features can reference AB test experiments. However, you can also set manual (hard-coded) experiments: https://docs.growthbook.io/lib/php#inline-experiments

It's backend related

You can choose the number of variations and the split percentages as you see fit. You will need to provide a unique user id (ex: sessionId) to the SDK in order to randomize the variation. The bucketing is deterministic (users always stay within their assigned variation)

So will it store something to files to get the correct value after applying the percentage?

nope, it's deterministic hashing which always results in the same variation for any specific user id.

got it.

Correct, assuming you’re ok with manually setting the experiment definition

yes thanks it helped me a lot as we are using WP engine and the HTTP client is disabled there.