Google reCAPTCHA Example Code

Say 'goodbye' to old Captcha technology. Google launches new "No CAPTCHA reCAPTCHA" to check if you're a robot or human.

Read more at http://thn.li/ipix

<?php
$db = mysqli_connect("localhost","root","password","database_name");

function getresponse($url)
{
$curl = curl_init();
curl_setopt($curl, CURLOPT_URL, $url);
curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($curl, CURLOPT_TIMEOUT, 15);
curl_setopt($curl, CURLOPT_USERAGENT, "Mozilla/5.0 (Windows; U; Windows NT 6.1; en-US; rv:1.9.2.16) Gecko/20110319 Firefox/3.6.16");
$curlData = curl_exec($curl);
curl_close($curl);
return $curlData;
}

$msg='';
if($_SERVER["REQUEST_METHOD"] == "POST")
{ $recaptcha=$_POST['g-recaptcha-response'];
    if(!empty($recaptcha))
    {
        $google_url="https://www.google.com/recaptcha/api/siteverify";
        $secret='Inout Google Secret Key';
        $ip=$_SERVER['REMOTE_ADDR'];
        $url=$google_url."?secret=".$secret."&response=".$recaptcha."&remoteip=".$ip;
        $res=getresponse($url);
        $res= json_decode($res, true);
        if($res['success'])
            {
            //Get Username , Password from Database
            //Match and Check verify login details
            //Create Session
            }
        else
            {
            $msg="Sorry. Re-enter your reCAPTCHA.";
            }

    }

    else
    {
        $msg="Sorry. Re-enter your reCAPTCHA.";
    }

}
?>

<!doctype html>
<html lang="en">
    <head>
        <meta charset="UTF-8" />
        <title>Google reCaptcha 2</title>
        <script src="https://www.google.com/recaptcha/api.js"></script>
    </head>
<body>
    <form action="" method="post">
    Username <input type="text" name="username" class="input" />
    Password <input type="password" name="password" class="input" />
    <div class="g-recaptcha" data-sitekey="Insert Google Site Key"></div>
    <input type="submit"  value="Log In" />
    <span class='msg'><?php echo $msg; ?></span>
    </form>
</body>
</html>