I didnt undertsand constants session PHP???

Question

Mmmmmmmmmmmmmmmmmmmmmmmmmm

Answer 1

Please, be more specific with your question and follow this guideness:
https://www.sololearn.com/discuss/1316935/?ref=app

Answer 2

I said I didnt undersrand the (constants) Lesson in PHP course Can you explain it more better..

Answer 3

You mean this?
https://www.sololearn.com/learn/PHP/2331/
When you don't understan a lesson, you should search for help in lesson comments. I have always found what I was looking for there.