PHP's core source code has transitioned to using Git for version control and is now hosted on GitHub, following a team decision to adopt a distributed version control system where Git emerged as the preferred choice. David Soria Parra, the release manager for PHP 5.4, has developed a workflow to facilitate the merging of GitHub pull requests into the PHP codebase. The move to GitHub, driven by the platform's collaborative benefits, marks a significant shift for the 13-year-old php-src repository, which has accumulated over 80,000 commits. This transition invites new contributors to participate in the development process, reflecting an open and collaborative approach to PHP's ongoing evolution.