<!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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