async: Run code asynchronously using the PHP program

How this work?

Well its basically "exec" with serialised closure. "Dressed" in nice libs like symfony process and console. I serialise callable function and sent to child process by exec. To get callback I register shutdown function and wait for process to finish.

Why not pcntl ?

• Pcntl extension fork, so you can forget using it in web applications like apache2/php-fpm etc its only for CLI
• forks retains the parent state (for example open files) so its problematic

Problems ?

• Calling exec is slower then fork
• Some resource/function/data must be passed directly to closure

Some research

• https://www.phproundtable.com/episode/asynchronous-php - good start to "know how" make php async
• https://amphp.org/ - non-blocking framework for PHP

Example ?

Sure take a look - https://github.com/krowinski/async/blob/master/example/example.php

Supports M$ Windows?

NO.

TODO

• process limit
• timeouts
• tests