---
title: PHP SDK
slug: feature-experimentation/docs/php-sdk
docTags: 
createdAt: 2026-08-05T20:40:03.000Z
---

## Version

For the current version number of this SDK, see [SDK Compatibility Matrix](docId:2shbZfPCkPAZ0mlZpL1TU).

## Reference

For reference documentation, see the left-hand menu, or start with [Installing the PHP SDK](docId:-VqR1QY2XUkth0kfhIcVA).

## Source files

- [PHP SDK repo on GitHub](https://github.com/optimizely/php-sdk)
- [changelog](https://github.com/optimizely/php-sdk/blob/master/CHANGELOG.md)