Actually, frankus is correct that you typically wants exists instead of defined when testing for the existence of a hash or array element. However, if you are truly needing defined, then your code is correct. As for the code you have shown us, I think we need more code to figure out what's wrong. Oh, and since the second if is dependant on the first, why not combine them? It's clearer to read (I left defined in on the off chance that this is really what you need):

if ( ! defined $FDomainName->{ WEBFWD } and defined $FDomainName->{ Do
+cumentRoot } ) {
    $FDomainName->{ WEBSPACE } = "TRUE";
}

[download]

Cheers,
Ovid

Join the Perlmonks Setiathome Group or just click on the the link and check out our stats.

In reply to (Ovid) Re: Reliably checking that something doesn't exist by Ovid
in thread Reliably checking that something doesn't exist by ritontor

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.