[fizdoonk]

register_global

[astrodust]

If you're using that you're going to hard-fail even the most cursory of security audits.

[CiPHPerCoder]

extract($_REQUEST);

Look, one-line register_globals polyfill.

[jccc]

This kind of breezy dismissal is really frustrating. Developers and admins in the field are dealing with this situation for the reasons I gave above, and not out of simple ignorance.