Perl Cd Bookshelf [Electronic resources] نسخه متنی

21.6.1. Problem

To access the form's various parameters, use
$r->content to access POSTed parameters and
$r->args to access GET parameters encoded in
the URL.

%post_parameters = $r->content;
%get_parameters = $r->args;

You can call $r->content only once per request
because the first call consumes all POSTed data.

Processing form parameters without Apache::Request is problematic
with values that occur multiple times. For example, a
SELECT list with MULTIPLE
enabled sends repeated entries for the same parameter name. Putting
them into a hash preserves only one of those entries. Apache::Request
solves this problem by accumulating multiply-submitted parameters in
an array.

Form parameters POSTed to your handler can be a problem. The nature
of Apache is that once one handler reads the POSTed data, another
handler cannot come along later and reread that same information. So
if you're going to process POSTed form parameters, you had better
keep the decoded parameters around in case another handler wants to
access them. The instance constructor handles this
for us. When two handlers both call the instance
constructor, the second handler gets back the Apache::Request object
populated by the first, with form parameters already decoded.

The Apache::Request $r->param interface is
based on the CGI module's parameter-parsing interface.