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<!DOCTYPE html><html>
 <head>
 <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
 <title></title>
 </head>
 <body>
 <form method="post"><div>
 <?php
 require 'lib/NamedButtonsCaptcha.php';
 
 $captcha = new NamedButtonsCaptcha();
 $captcha->setKeyStorage(new NamedButtonsCaptcha_KeyStorage_Session());
 
 if ('POST' === $_SERVER['REQUEST_METHOD']) {
 $values = isset($_POST['nbc']) ? $_POST['nbc'] : array();
 
 if ($captcha->isValid($values)) {
 echo '<div style="color:green">Verification succeeded</div>';
 } else {
 echo '<div style="color:red">Verification failed</div>';
 }
 }
 
 $captcha->render();
 ?>
 <br />
 <br />
 <input type="submit" value="Verify" />
 </div></form>
 </body>
 </html>
 
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