Beefy Boxes and Bandwidth Generously Provided by pair Networks
Problems? Is your data what you think it is?

Comment on

( #3333=superdoc: print w/replies, xml ) Need Help??
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
# 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

Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post; it's "PerlMonks-approved HTML":

  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.
  • Log In?

    What's my password?
    Create A New User
    and all is quiet...

    How do I use this? | Other CB clients
    Other Users?
    Others drinking their drinks and smoking their pipes about the Monastery: (7)
    As of 2018-05-25 10:11 GMT
    Find Nodes?
      Voting Booth?