Prevent variable changes

[triexa]

My source code is going to be encrypted, so people will be unable to alter important data. HOWEVER, I intend to implement plugins/hooks similar to WordPress/vBulletin... This seems like an open door for someone to just change all my variables - such as various limitations based on their license.

Is there ANY way I could at least help guard against this sort of violation of my software?

[kromey]

Use define where you can, but anything that you'd need to alter would still be vulnerable. You could do a slew of validation to make sure that no one is altering your variables, or else implement some clever way to grab all their variables, copy them elsewhere, unset the originals, do your thing, then recreate their variables so their scripts will continue running while yours remain unaffected by any variables they use.