PHP Constants | How to create constants in PHP with Examples?
PHP Constants
PHP Magic Constants: Usage and Debugging with Examples - TutorialChip
PHP Magic Constants | Examples of How Magic Constants Work in PHP
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
SOLUTION: PHP Contants and Math Function - Studypool