Just to chime in on this thread; I like your implementation and (after
reading through all the other comments so far), prefer the lexical
keyword to import variables.

As I've said before, the closure aspect of this is the hardest to gel
into PHP, which deliberately avoids inheriting scopes.  Since everyone
has grown up explicitly managing this via the global keyword, I think
it makes a lot of sense to use similar syntax for getting at those
lexical values.

I'm +1 for inclusion of this into the next release of PHP (post 5.3),
and like Andrei, would love there to be a first class callable type
for dynamic invocation of "regular" functions and methods.

--Wez.

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