As is mentioned in this post on the Symfony Finland site, the PHP-PM project has hit their first stable release, v1.0, that includes some nice tools as well.

Running an application server written in PHP has been feasible for some years. One of the robus mature options for this has been PHP-PM, a process manager. Now the project has reached a major milestone with the release of 1.0.

The PHP-PM team released the first stable release on 8th of January 2018. It builds on the work done for some years and it builds on ReactPHP. ReactPHP is a low-level library for event-driven programming in PHP.

PHP-PM allows creating long running PHP processes that serve applications directly instead of relying an embedded PHP (like with Apache's mod_php) or a web server with PHP process manager (as with Nginx and PHP-FPM).

Updates for this release include the addition of bridges for static handling, PSR-7 integration and version bumps for Symfony components used in the system. You can check out the full list of changes in the release notes if you want to see more. The post also links to other articles with more reading and tutorials covering PHP-PM and how to put it to use (including Docker integration and basic benchmarks).