PHP math always returns 0

[jimsy7777]

I'm currently creating a script for some unlock codes around my site...

unfortunately.. these math always returns 0 thus always returning true...

PS. all numerical variables should be interpreted as integers

This script should only return true with this code:
RSXL-MK

EDIT:
I managed to make the code work now!
Please close this thread

 

[ellescuba27]

What did you do to make it work?