I tried to explain this in my replies to both of your previous posts, but maybe I didn't put it clearly enough: your variables hold their values between requests because you are creating closures. You create a closure any time you run code under Apache::Registry that looks this: 
my $foo = $query->param('foo');

bar();

sub bar {
  print $foo;
}

[download]
Now you will never be able to change the value of $foo for that bar() sub.

It's easy to prevent this. You can pass the values to your subs: 

my $foo = $query->param('foo');

bar($foo);

sub bar {
  my $foo = shift;
  print $foo;
}

[download]
In addition to avoiding closures, it's simply a better programming practice. it improves abstraction and makes your code more robust. You could also put your subs in a separate module (a real module with a package name, not just a "require lib.pl" thing), which would force you to pass values to your subs.

In reply to Re: mod_perl with Apache::Registry with CGI.pm design considerations by perrin
in thread mod_perl with Apache::Registry with CGI.pm design considerations by hacker

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.