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
PHP Magic Constants: Usage and Debugging with Examples - TutorialChip
PHP Constants - YouTube
Variables and Constant in PHP - OCJP
Notice: Undefined Variable in PHP
Complete Tutorials of PHP OOP Constants with Example code - DevOpsSchool.com
PHP Echo Space Between Variables | Multiple spaces