Tie'ing variables

Hi, Analyzing PHP's routines a bit, it seems that the slowest part of a "generic" request is populating the special arrays, $_ENV, $_GET, etc. I was wondering if it might be possible to "tie" these arrays to a function (if you don't understand that, look at Perl for a definition). One could populate them as an overloaded object, and then array accesses would work - I guess. But I would prefer a cleaner mechanism. This would prevent a costly overhead for elements that don't really need to be there, and yield only a slight performance cost when accessing overloaded elements in these arrays. -Sterling -- "The computer programmer is a creator of universes for which he alone is responsible. Universes of virtually unlimited complexity can be created in the form of computer programs." - Joseph Weizenbaum