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Books:

* PHP & MySQL: Novice to Ninja by Tom Butler

* PHP 8 - Quick Scripting Reference by Mikael Olsson

* PHP 8 Objects, Patterns, and Practice by Matt Zandstra

* Programming PHP (2020) by Kevin Tatroe and Peter MacIntyre

I personally found them to be really good. I learned a lot from the first book especially.

You can find the code from the first book here: https://github.com/spbooks/phpmysql7

I hope this helps.