Their is an error showing while learning from sololearn

Question

In php , constant section has example but as I run it it shows error , why please explain
https://code.sololearn.com/w2uVaeLN1iU1/?ref=app

Answer 1

its deprecated feature, sololearn may have not remove them from the lesson.

Answer 2

Prateek Kumar Agarwal You have already asked.

https://www.sololearn.com/Discuss/2170510/?ref=app

Answer 3

Thanks