FAQ 9.16 How do I decode a CGI form?


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This is an excerpt from the latest version perlfaq9.pod, which
comes with the standard Perl distribution. These postings aim to
reduce the number of repeated questions as well as allow the community
to review and update the answers. The latest version of the complete
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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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