...

my $showPUV = 0;

...

sub FilterMessage {
  ...
  our $showPUV;
  ...

[download]

Those are two different variables! The first is a lexical (my) variable, scoped to the file. The second is an alias to the package (our) variable $main::showPUV.

Solution 1 

my $showPUV = 0;

sub FilterMessage {
  ...
  if ( $showPUV ...
  ...

[download]

Noone outside of this file can access $showPUV. FilterMessage can since it's in the same file, even if it's called from another file.

Solution 2 

our $showPUV = 0;

sub FilterMessage {
  ...
  if ( $showPUV ...
  ...

[download]

Everyone can access $showPUV (altough other packages must use $main::showPUV). our $showPUV; is optional in FilterMessage, because the one at the top level is still in scope.

Update: Clarified by adding "an alias to".

In reply to Re: problem with global variables going out of scope by ikegami
in thread problem with global variables going out of scope by Kelly Grant

Title:
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, details, 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, summary, 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.