FAQ 9.16 How do I decode a CGI form?

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9.16: How do I decode a CGI form?

    (contributed by brian d foy)

    Use the "CGI.pm" module that comes with Perl. It's quick, it's easy, and
    it actually does quite a bit of work to ensure things happen correctly.
    It handles GET, POST, and HEAD requests, multipart forms, multivalued
    fields, query string and message body combinations, and many other
    things you probably don't want to think about.

    It doesn't get much easier: the "CGI.pm" module automatically parses the
    input and makes each value available through the "param()" function.

            use CGI qw(:standard);

            my $total = param( 'price' ) + param( 'shipping' );

            my @items = param( 'item' ); # multiple values, same field name

    If you want an object-oriented approach, "CGI.pm" can do that too.

            use CGI;

            my $cgi = CGI->new();

            my $total = $cgi->param( 'price' ) + $cgi->param( 'shipping' );

            my @items = $cgi->param( 'item' );

    You might also try "CGI::Minimal" which is a lightweight version of the
    same thing. Other CGI::* modules on CPAN might work better for you, too.

    Many people try to write their own decoder (or copy one from another
    program) and then run into one of the many "gotchas" of the task. It's
    much easier and less hassle to use "CGI.pm".


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