a generic subroutine which takes a variable name and looks at it's caller's package to see if that variable is defined and if it's defined, returns it's value
Something like this should do (also complies with strictures too). 
sub isdef {
  my($var, $pkg) = ( shift, scalar(caller)."::" );

  return unless defined $main::{$pkg};
  return unless defined $main::{$pkg}{$var};
  return unless defined *{ $main::{$pkg}{$var} }{SCALAR};
  return ${ *{ $main::{$pkg}{$var} }{SCALAR} };
}

[download]
Note, this will only work with scalar value types.
HTH

_________
broquaint

In reply to Re: examining other package's variable without 'use' by broquaint
in thread examining other package's variable without 'use' by praveenray

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.