from perldoc CGI

If you import any of the state-maintaining CGI or form-generating meth- ods, a default CGI object will be created and initialized automatically the first time you use any of the methods that require one to be present. This includes param(), textfield(), submit() and the like. (If you need direct access to the CGI object, you can find it in the global variable $CGI::Q). By importing CGI.pm methods, you can create visually elegant scripts:

But you referred to $CGI::Q before calling any of the methods noted.

Better to do away with the $CGI::Q and literally create it with: 

my $q = CGI->new;

[download]
after use CGI.... Especially since you're using it in $q->param.) Or do without the object altogether, which you could, because you imported the :standard methods in your use CGI qw/:standard/; statement. But you also are NOT using it for some of your other functions, which is confusing.

I generally import nothing, create the CGI object $q and use it for all methods. It'sa less confusing to me, even though it adds line noise.

--Bob Niederman, http://bob-n.com

In reply to Re: Understanding $CGI::Q by bobn
in thread Understanding $CGI::Q by daniel808

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.