PHP 8.1 introduced the new Fiber class (see the proposed RFC here https://wiki.php.net/rfc/fiber), which allows running coroutines inside your script, i.e. two functions executing simultaneously

This article describes a TDD (Test Driven Development) approach to implement a Finite State Machine (FSM) using PHP+Laravel. However, such method is general and could be used in the programming language of your choice.

Learn how to send a test email from a Laravel app

This article describes how to use Netgear Arlo Cameras API. Even though no public API is provided, I succeeded in interacting with the cameras by sniffing the traffic sent from the official web application