Warning: Use of undefined constant on PHP 7.4

[mmmarcelo]

I am getting many warning errors on PHP 7.4:

Warning: Use of undefined constant

https://www.php.net/manual/en/function.define.php

Warning
Defining case-insensitive constants is deprecated as of PHP 7.3.0.

There's any suggestion to update define to variables?

Thank you

[♥ecartz]

1 hour ago, mmmarcelo said:

Warning
Defining case-insensitive constants is deprecated as of PHP 7.3.0.

This is not from core code, which doesn't use that parameter.  Certainly not in the current Phoenix and I don't believe so in older versions of osCommerce. 

If you are simply getting

1 hour ago, mmmarcelo said:

Warning: Use of undefined constant

that's telling you that a define is missing.  Nothing to do with case sensitivity.  Someone might be able to help more if you gave the actual error which says which "constant" is missing.