i got it working now with the aid of livehttpheader. thank you corion and frodo. 
#!/usr/bin/perl -w

use LWP::UserAgent;
$ua = LWP::UserAgent->new;
$ua->agent("Mozilla 8.0");

use HTTP::Request::Common qw(POST);


my $req = (POST 'https://www.i.ph/signup_check.php',
          [ username => 'recall',
            useremail => 'acerel54@linuxmail.org',
            userpassword1 => 'recall',
            userpassword2 => 'recall',
            usermobile => 639165263265,
            userchallenge => 'recall',
            useranswer => 'recall',
            agreement => 'on',
            domainname => "",
            'submit.x' => 49,
            'submit.y' => 12
            ]);

$request = $ua->request($req);
$content = $request->content;
print $content;
exit;

[download]
i just need to format the printed html content into something more human-readable and for further processing with Test::More. any tips?

In reply to Re: https POST and checkboxes by marcpascual
in thread https POST and checkboxes by marcpascual

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.