note 84214 deleted from function.isset by mgf

Note Submitter: daveb at SPAMLESS dot davebeta dot com ---- "Interestingly" isset() returns false for null - even though a variable containing null has actually been set to a null value. I think I'm right in saying that this actually makes it impossible to distinguish if a variable exists and is null (can safely be used) or is undefined (causes a notice if used with anything other than isset). This is probably something you will never need to know - but I think it is illogical and causes confusion about nulls