Guthrie developed multi-version PHP support for the PEAR path in the Homebrew/homebrew-core repository, focusing on improving package resolution when multiple PHP versions are installed. By updating the PEAR path to include the major and minor PHP version, Guthrie ensured that developers and CI pipelines could reliably switch between php@ versions without encountering environment-specific issues. The work was implemented in Ruby and leveraged Homebrew’s package management framework, resulting in a more robust and predictable PHP tooling experience. This targeted feature addressed compatibility challenges and improved the reliability of development and automation workflows involving PHP across diverse environments.