---
title: PHP-SDK - 4.0.0
slug: feature-experimentation/release-notes/php-sdk-4-0-0
docTags: 
createdAt: 2026-07-20T15:44:51.354Z
---

## [#400](docId\:R9SA-llP8MNNYNWHV9MLU)4.0.0

June 12, 2023

- Provided support for PHP version 8.x.
- Version 4.0.0 requires PHP8+.
- Version 3 requires PHP5.5+ up to PHP7.

[https://github.com/optimizely/php-sdk/releases/tag/4.0.0](https://github.com/optimizely/php-sdk/releases/tag/4.0.0)