PHP Magic Constants | Examples of How Magic Constants Work in PHP
Object-Oriented Programming (OOP) in PHP
PHP constants | PHP Constants Types | How to Define a Constant in php
Notice: Undefined Variable in PHP
Complete Tutorials of PHP OOP Constants with Example code - DevOpsSchool.com
SOLUTION: PHP Contants and Math Function - Studypool
Constants in PHP | Types of Constants | Define Constants - FutureFundamentals
Use PHP Class constants. (Version française) | by Smaine Milianni | Medium
Complete Tutorials of PHP OOP Constants with Example code - DevOpsSchool.com
Tim MacDonald on Twitter: "💡 TIL you can do string concatenation in a PHP constant assignment and even use other constants created in the same class. I don't know what to do