Sure, I was just bashing on SRB - the code quality of McCodes (especially the free version) is not great.
Learning PHP
I'd recommend you start learning PHP first then use that knowledge to start developing a game. Once you have PHP installed on your machine, run `php -S localhost:8080` and then you can have your own local server running - no real need for applications such as XAMPP. Or, use an online sandbox, such as https://replit.com/ to run PHP code in the cloud (example: https://replit.com/@409H/example-php)
Get used to variables, functions, classes, dependencies. It'll be a better foundation for you over learning off scripts created years ago with near-zero standards (and breaking modern standards).
A very popular PHP framework is Laravel. You can learn it for free on Laracasts.
Learning Deployment (not server management)
There have been recommendations within this topic on how to deploy your code to production. Some of those recommendations are somewhat archaic (though they do work and get you the end result). I'd suggest learning git (version control) and deploying through a CICD pipeline to a service such as Heroku. You don't want to add another learning branch to your todo list - such as server maintenance and peripheral package management.