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Zitat:
Every programming language has a philosophy, and these days most of these philosophies have to do with the way the names of variables are managed. Details of which variables are visible to which parts of the program, and what names mean what, and when, are of prime importance. The details vary from somewhat baroque, in languages like Lisp, to extremely baroque, in languages like C++. Perl unfortunately, falls somewhere towards the rococo end of this scale.
The problem with Perl isn't that it has no clearly-defined system of name management, but rather that it two systems, both working at once. Here's the Big Secret about Perl variables that most people learn too late: Perl has two completely separate, independent sets of variables. One is left over from Perl 4, and the other is new. The two sets of variables are called package variables' and lexical variables', and they have nothing to do with each other.
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