You can also look up for these other topics:
Framework
Coding Standards
Boilerplate
CMS
Tool
Security
Hacktoberfest
A tool to automatically fix PHP Coding Standards issues
FriendsOfPHPA tool to automatically fix PHP Coding Standards issues
PHP-CS-FixerSOLID Principles - simple and easy explanation
nahidulhasanA set of custom fixers for PHP CS Fixer
kubawerlos