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Hi, I believe you are missing a few things in the PHP code.

This might be the HTTPClient resource that you need:

```$growthbook = Growthbook\Growthbook::create()
  -&gt;withHttpClient($client, $requestFactory);```

And these interfaces:

```\Psr\Http\Client\ClientInterface $client
\Psr\Http\Message\RequestFactoryInterface $requestFactory```