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I'm also in the process of learning some perl internals. Besides perlguts, perlxs, the book "Extending and Embedding perl" is a good read. One thing I learnt is the module Devel::Peek, using it you can see some internals of perl variables, for example
# devel.pl use Devel::Peek; my $a = "test"; Dump $a; my $b = 5; Dump $b; my $c = "123"; Dump $c;
will give you:
SV = PV(0x22548c) at 0x18244e8 REFCNT = 1 FLAGS = (PADBUSY,PADMY,POK,pPOK) PV = 0x22cadc "test"\0 CUR = 4 LEN = 5 SV = IV(0x1828e5c) at 0x182450c REFCNT = 1 FLAGS = (PADBUSY,PADMY,IOK,pIOK) IV = 5 SV = PV(0x2254a4) at 0x18244dc REFCNT = 1 FLAGS = (PADBUSY,PADMY,POK,pPOK) PV = 0x22b26c "123"\0 CUR = 3 LEN = 4
Besides showing the ref count, the magic flags, you can roughly see how the in-memory structure looks like.

In reply to Re: Behind the Scenes - Perl Variables by johnnywang
in thread Behind the Scenes - Perl Variables by kidd

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