---
title: PHP-SDK - 3.1.0
slug: feature-experimentation/release-notes/php-sdk-3-1-0
docTags: 
createdAt: 2026-07-20T15:44:47.637Z
---

\## 3.1.0
May 3rd, 2019

\### New Features:
\- Introduced Decision notification listener to be able to record:
\- Variation assignments for users activated in an experiment.
\- Feature access for users.
\- Feature variable value for users.

\### Bug Fixes:
\- Feature variable APIs return default variable value when featureEnabled property is false. (\[#159]\([https://github.com/optimizely/php-sdk/pull/159](https://github.com/optimizely/php-sdk/pull/159)))

\### Deprecated
\- Activate notification listener is deprecated as of this release. Recommendation is to use the new Decision notification listener. Activate notification listener will be removed in the next major release.

[https://github.com/optimizely/php-sdk/releases/tag/3.1.0](https://github.com/optimizely/php-sdk/releases/tag/3.1.0)