PHP 8.4.22

Remember when PHP 8.0 landed in 2020 and brought us the JIT compiler for the first time? Back then, JIT was experimental — a bold bet on the languages future. PHP 8.4.22, released June 4, 2026, is the latest chapter in that journey, proving that the Tracing JIT is no longer an experiment but a mature, production-grade feature.

The Tracing JIT Matures

PHP 8.4.22 patches several Tracing JIT instabilities that developers have been chasing in production environments. The JIT engine, first introduced in PHP 8.0, has gone through five years of refinement — and this release finally addresses crashes that occurred under specific CPU architectures, particularly on older hardware without AVX support.

OpenSSL 4.0 Compatibility

As the OpenSSL ecosystem evolves, so does PHP. This release brings improved OpenSSL 4.0 support, including fixes for memory leaks on error paths in openssl_open() and proper AES-GCM-SIV encryption behavior. If you are running modern TLS stacks, this update is essential.

Memory Leak Fixes

A recurring theme in PHP 8.4.x maintenance releases has been memory management. Version 8.4.22 closes several long-standing leak issues across the OpenSSL extension, the OPcache module, and the core engine. The cumulative effect is a measurable reduction in memory usage under sustained load.

Breaking Changes

There are no breaking changes in this release. PHP 8.4.22 is a pure bug-fix and security release, making the upgrade path seamless for anyone already on PHP 8.4.x.

What This Means for Your Stack

PHP 8.4 continues to receive active support until December 31, 2026, after which it transitions to security-only coverage. Users still on PHP 8.2 or 8.3 should plan their migration now — the ecosystem has moved on, and the performance gap widens with every release.

PHP 8.4.22 is available now via php.net and your package manager. Update today, especially if you rely on Tracing JIT or OpenSSL 4.0.