setup-php VS Money

I found shivammathur/setup-php did a better job on supporting old PHP versions, and you don't have to worry about the composer & extension compatibility, it handles those for you.

this is a good base https://github.com/shivammathur/setup-php

Setup PHP (GitHub Action)

There is also an RSS feed you can subscribe for setup-php releases https://github.com/shivammathur/setup-php/releases.atom

moneyphp: PHP implementation of Fowler's Money pattern

There's also https://github.com/moneyphp/money, which is great.

Or you can use MoneyPHP, which uses BCMath, and it takes care of all of your problems.

Instead, you want to use a Money object of some sort instead; e.g. https://github.com/moneyphp/money.

Yeah I usually use moneyphp for this

https://github.com/moneyphp/money to handle money

With that in place, let's talk about our test project for a minute. We are going to build a small library on top of Money, a popular PHP package facilitating the manipulation of monetary values and currencies.

In addition to the essential advice above to use Integers of the lowest denomination to store prices, you can also look into using a library to help with all the money math, conversions, comparisons etc https://github.com/moneyphp/money

Read the readme from moneyphp: https://github.com/moneyphp/money