As Wez pointed out, this is almost ready to insert into the parser. Most of yesterdays conversation was spent hashing out the ways that this should be implemented.
Ok, now I'm confused. Why is an RFC (Request For Comment) posted to the internals list if it was already decided before?
An expression CANNOT be allowed for the first argument - because you cannot check to see if an expression isset().
It could actually quite easily be done: Just suppress the E_NOTICE for undefined variables while evaluating this expression.
But as there is no interest in pursuing this I'll shut up.
- Chris
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