Feature Experimentation docs

Feature Experimentation API

Release Notes for Feature Experimentation

2026 Optimizely Feature Experimentation release notes

2025 Optimizely Feature Experimentation release notes

2024 Optimizely Feature Experimentation release notes

2023 Optimizely Feature Experimentation release notes

2022 Optimizely Feature Experimentation release notes

Feature Experimentation SDK release notes

Feature Experimentation API changelog – 2025

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Release notes

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PHP SDK

PHP-SDK - 2.0.0-beta1

0 min

See [Changelog](https://github.com/optimizely/php-sdk/blob/master/CHANGELOG.md#200-beta1).

https://github.com/optimizely/php-sdk/releases/tag/2.0.0-beta1

Updated 28 Aug 2026

PHP-SDK - 2.0.0

PHP-SDK - 1.5.0

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