The replies of LanX and 2teez in this thread pretty much say it all. But take a look at what perlsub has to say about parameter passing (in various sections), and at the Function Parameters sub-section in chromatic's very good Modern Perl (chromatic's user node has a link to a free download link).

In reply to Re^4: Elements added to hash in for loop by AnomalousMonk
in thread Elements added to hash in for loop by nathaniels

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