PHP feature flags installation

Add the following to composer.json:

JSON
{
    "require": {
        "posthog/posthog-php": "3.0.*"
    }
}

And then install the dependencies with the command:

Terminal
composer install

In your app, set your project API key before making any calls.

PHP
PostHog\PostHog::init("<ph_project_api_key>",
  array('host' => 'https://us.i.posthog.com') 
);

Note: As a rule of thumb, we do not recommend having API keys in plaintext. Setting it as an environment variable is best.

You can find your project API key and instance address in the project settings page in PostHog.

Next steps

Resource	Description
Adding feature flag code	How to check flags in your code for all platforms
Framework-specific guides	Setup guides for React Native, Next.js, Flutter, and other frameworks
How to do a phased rollout	Gradually roll out features to minimize risk
More tutorials	Other real-world examples and use cases

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