function form()
{
#-- stop if user already verified
if (!empty($_COOKIE[CAPTCHA_COOKIE]) && $_COOKIE[CAPTCHA_COOKIE] == (int) (time() / 1000000)) {
return "";
}
$title = translate('Enter Characters Seen in Graphic');
$more = translate('Enter the correct letters and numbers from the image into the text box...');
#-- prepare image text
$pw = captcha::mkpass();
$hash = captcha::hash($pw);
//$alt = htmlentities(captcha::textual_riddle($pw));
$alt = $title;
#-- image
$img = captcha::image($pw, 200, 60, CAPTCHA_INVERSE, CAPTCHA_MAXSIZE);
if (CAPTCHA_DATA_URLS && !strpos('MSIE', $_SERVER['HTTP_USER_AGENT'])) {
$img_fn = 'data:image/jpeg;base64,' . base64_encode($img);
} else {
$img_fn = CAPTCHA_TEMP_DIR . '/' . captcha::store_image($img) . '.jpg';
}
//echo $img_fn;
#-- emit html form
$html = '
<div class="captcha">
<fieldset style="width:420px">
<legend>' . translate('Challenge/Response') . '</legend>
<table border="0" summary="captcha input" width="400px"><tr>
<td colspan="2"><small>' . $more . '</small></td></tr><tr>
<td><img name="captcha_image" id="captcha_image" src="' . $img_fn . '" height="60" width="200" alt="' . $alt . '" /></td>
<td>' . $title . '<br /><input name="captcha_hash" type="hidden" value="' . $hash . '" />
<input name="captcha_input" type="text" size="7" maxlength="16" style="height:46px;font-size:34px; font-weight:bold;" />
</td></tr></table>
</fieldset>
</div>
';
return $html;
}