---
title: PHP-SDK - 2.2.1
slug: feature-experimentation/release-notes/php-sdk-2-2-1
docTags: 
createdAt: 2026-07-20T15:45:09.510Z
---

\### Bug fixes
\- fix(generateBucketValue): Avoid negative bucket number for PHP x86. (\[#137]\([https://github.com/optimizely/php-sdk/pull/137](https://github.com/optimizely/php-sdk/pull/137)))
\- fix(phpdoc-notification-callback): Fixes phpdoc primitive type of notification-callback. (\[#135]\([https://github.com/optimizely/php-sdk/pull/135](https://github.com/optimizely/php-sdk/pull/135)))

[https://github.com/optimizely/php-sdk/releases/tag/2.2.1](https://github.com/optimizely/php-sdk/releases/tag/2.2.1)