PostHog::init crashes when adding a personalAPIKey

[wesleymartincc]

I have been trying to integrate the Experiments feature into our site. I have set up a new experiment at https://app.posthog.com/experiments and it is running.

I am currently using "posthog/posthog-php": "^3.0" and php 8.1.

I have been trying to get PostHog::getFeatureFlag('sell-your-classic-test', 'some distinct id'); to work but it would keep returning null. I tried:

if (PostHog::isFeatureEnabled('sell-your-classic-test', 'some distinct id')) {
    // do something here
}

But this always returns false. I then read about Local Evaluation which requires a personal API key. I created one and have added it to PostHog::init but when I do this I get the below error:

array_key_exists(): Argument #2 ($array) must be of type array, null given

Which is found in vendor/posthog/posthog-php/lib/Client.php:356.

This is the code that I'm running:

PostHog::init(
    apiKey: "phc_xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx",
    personalAPIKey: "phx_xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx",
);

I have also tried:

PostHog::init(
    "phc_xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx",
    [],
    null,
    "phx_xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx",
);

Any help would be helpful.

[wesleymartincc]

For the time being I'm using the /decide?v=2 API.