'item',
'#title' => 'captcha image',
'#weight' => 0,
'#value' => ') . ')
',
);
$form['captcha_response'] = array (
'#type' => 'textfield',
'#title' => t('Word'),
'#defaultvalue' => '',
'#weight' => 0,
'#required' => TRUE,
'#validate' => array('_captcha_validate' => array()),
'#description' => t('Please type in the letters/numbers that are shown in the image above.')
);
return $form;
}
function _captcha_image_validate(&$captcha_word, &$correct) {
$captcha_word = drupal_strtolower($captcha_word);
if ($captcha_word == $_SESSION['captcha']) {
$correct = true;
}
else {
$correct = false;
form_set_error('captcha_response', t('The image verification code you entered is incorrect.'));
}
}
/**
* Prints an image containing a captcha code.
*/
function _captcha_image() {
// there are a few hard coded functions I'd like to eliminate here,
// but for the time being we'll let them be.
//if we don't have GD2 functions, we can't generate the image
if (!function_exists('imagecreatetruecolor')) return;
// Set headers
header('Expires: Mon, 01 Jan 1997 05:00:00 GMT');
header('Cache-Control: no-store, no-cache, must-revalidate');
header('Cache-Control: post-check=0, pre-check=0', false);
header('Pragma: no-cache');
header('Content-type: image/png');
$string = _captcha_code();
// set up image, the first number is the width and the second is the height
$im = imagecreatetruecolor(180, 80);
// creates two variables to store color
$background = imagecolorallocate($im, rand(180, 250), rand(180, 250), rand(180, 250));
$foreground = imagecolorallocate($im, rand(0, 80), rand(0, 80), rand(0, 80));
// fill image with bgcolor
imagefill($im, 0, 0, $background);
// Get truetype font list
$fonts = _captcha_font_list();
// writes string
if (function_exists(imagettftext) && count($fonts) > 0) {
// write text using a truetype font
$charSize = 24; // font size
$charWidth = 0; // width of previous character
$x = 10; // initial x position
$y = 30;
// iterate over characters
for ($i=0;$i