/**
* Verify a captcha based on the input value entered by the user and the seed token passed.
*
* @param string $input_value
* @param string $seed_token
* @return bool
*/
function captcha_verify_captcha($input_value, $seed_token)
{
if (strcasecmp($input_value, captcha_generate_captcha($seed_token)) == 0) {
return true;
}
return false;
}
<?php
/**
* Elgg captcha plugin graphics file generator
*
* @package ElggCaptcha
*/
$token = get_input('captcha_token');
// Output captcha
if ($token) {
// Generate captcha
$captcha = captcha_generate_captcha($token);
// Pick a random background image
$n = rand(1, elgg_get_plugin_setting('captcha_num_bg', 'captcha'));
$image = imagecreatefromjpeg(elgg_get_plugins_path() . "captcha/backgrounds/bg{$n}.jpg");
// Create a colour (black so its not a simple matter of masking out one colour and ocring the rest)
$colour = imagecolorallocate($image, 0, 0, 0);
// Write captcha to image
//imagestring($image, 5, 30, 4, $captcha, $black);
imagettftext($image, 30, 0, 10, 30, $colour, elgg_get_plugins_path() . "captcha/fonts/1.ttf", $captcha);
// Output image
ob_start();
// start a new output buffer
imagejpeg($image);
$ImageData = ob_get_contents();
$ImageDataLength = ob_get_length();
ob_end_clean();
// stop this output buffer
header("Content-Type: image/jpeg");
header("Content-Length: " . $ImageDataLength);
header('Cache-Control: no-cache, no-store, must-revalidate');