Backup MySQL Database

[jodean]

What is the purpose of these errors and future errors warning?

[lat9]

What is the purpose of these errors and future errors warning?

It's part of PHP's evolution. The PHP authors have been taking steps over the past few years to improve performance. Apparently the undefined-constants' checking at runtime was determined to be a bottle-neck.

Those messages are PHP's notice that an undefined constant was found and, for now, it's going to be interpreted as if the code had placed quotes around the constant name. Future versions of PHP will stop during the parsing step and issue an error if an undefined constant is discovered.