Another way to do it would be to write a hidden field that is, in essence, a data constructor:

<INPUT TYPE="hidden" name="user_list" value="([dynamic list here])">

and then in the Perl program, use param('user_list') to construct your
+ array

#! Perl -w
use strict;
use CGI;
$my q = CGI->new;
my @users = scalar $q->param('user_list');
&do_stuff($_) for (@users); # or whatever
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