<td>
                        $vbphrase[confirm_email_address]:<br />
                        <input type="text" class="bginput" name="emailconfirm" size="25" maxlength="50" value="$emailconfirm" dir="ltr" />
                    </td>

        'emailconfirm'       => TYPE_STR,

        OR empty($vbulletin->GPC['emailconfirm'])

    // check for matching email addresses
    if ($vbulletin->GPC['email'] != $vbulletin->GPC['emailconfirm'])
    {
        $userdata->error('emailmismatch');
    }

        $emailconfirm = htmlspecialchars_uni($vbulletin->GPC['emailconfirm']);