Swoole
Coroutine-based concurrency library for PHP
... or create thousands of light weight fibers within one Linux process. Swoole PHP network framework enhances the efficiency of development team. The network layer in Swoole is event-based and takes full advantage of the underlying epoll/kqueue implementation, making it really easy to serve millions of requests. Swoole 4.x uses a brand new engine kernel and now it has a full-time developer team, so we are entering an unprecedented period in PHP history which offers a unique possibility for rapid evolution.