gistfile1.txt

   $req->param
       Returns GET and POST parameters with a CGI.pm-compatible param method.
       This is an alternative method for accessing parameters in
       $c->req->parameters.

           $value  = $c->request->param( 'foo' );
           @values = $c->request->param( 'foo' );
           @params = $c->request->param;

       Like CGI, and unlike earlier versions of Catalyst, passing multiple
       arguments to this method, like this:

           $c->request->param( 'foo', 'bar', 'gorch', 'quxx' );

       will set the parameter "foo" to the multiple values "bar", "gorch" and
       "quxx". Previously this would have added "bar" as another value to
       "foo" (creating it if it didn't exist before), and "quxx" as another
       value for "gorch".

       NOTE this is considered a legacy interface and care should be taken
       when using it. "scalar $c->req->param( 'foo' )" will return only the
       first "foo" param even if multiple are present; "$c->req->param( 'foo'
       )" will return a list of as many are present, which can have unexpected
       consequences when writing code of the form:

           $foo->bar(
               a => 'b',
               baz => $c->req->param( 'baz' ),
           );

       If multiple "baz" parameters are provided this code might corrupt data
       or cause a hash initialization error. For a more straightforward
       interface see "$c->req->parameters".