OpenSwoole is a PHP extension that allows to build high-performance, async multi-tasking web services with PHP. It offers a very lightweight Coroutine API to that allows to create thousands coroutines within one Linux process.
It offers a range of multi-threaded I/O modules (HTTP Server, WebSockets, TaskWorkers, Process Pools) out of the box and support for popular PHP clients like PDO and CURL.
URL: https://confoo.ca/en/2023
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Info about OpenSwoole: https://openswoole.com/