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Google New reCaptcha using PHP - Are you a Robot?

Today Google has been introduced new reCaptcha API called Are you a robot? “No Captcha reCaptcha” a complete new design captcha system. This protects your website for spammers and robots, in this post I had implemented new reCaptch API system with HTML login form using PHP. I like the new design it is clean and impressive, hope you will like it. Please take a look quick look at the demo.

Get reCaptcha Key
Click here to create a Google reCaptcha application. Register Your Website Give your website domain details without http:

Google Site Key
You will use this in HTML code.

Google Secret Key This will help your website to communication with Google.

HTML Code
Contains simple HTML code with Google reCaptcha widget snippet. Here you have to modify the Google Site Key value.
<html>
<head>
/* Google reCaptcha JS */
<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="Google Site Key"></div>
<input type="submit" value="Log In" />
<span class='msg'><?php echo $msg; ?></span>
</form>
</body>
</html>
index.php Contains PHP code, here you have to modify the Google Secret Key.
<?php
include("db.php");
session_start();

$msg='';
if($_SERVER["REQUEST_METHOD"] == "POST")
{
$recaptcha=$_POST['g-recaptcha-response'];
if(!empty($recaptcha))
{
include("getCurlData.php");
$google_url="https://www.google.com/recaptcha/api/siteverify";
$secret='Google Secret Key';
$ip=$_SERVER['REMOTE_ADDR'];
$url=$google_url."?secret=".$secret."&response=".$recaptcha."&remoteip=".$ip;
$res=getCurlData($url);
$res= json_decode($res, true);
//reCaptcha success check 
if($res['success'])
{
//Include login check code
}
else
{
$msg="Please re-enter your reCAPTCHA.";
}

}
else
{
$msg="Please re-enter your reCAPTCHA.";
}

}
?>
Login Check Code This code will verify username and password details in database.
$username=mysqli_real_escape_string($db,$_POST['username']);
$password=md5(mysqli_real_escape_string($db,$_POST['password']));
if(!empty($username) && !empty($password))
{
$result=mysqli_query($db,"SELECT id FROM users WHERE username='$username' and passcode='$password'");
$row=mysqli_fetch_array($result,MYSQLI_ASSOC);
if(mysqli_num_rows($result)==1)
{
$_SESSION['login_user']=$username;
header("location: home.php"); //Success redirection page. 
}
else
{
$msg="Please give valid Username or Password.";
}

}
else
{
$msg="Please give valid Username or Password.";
}
getCurlData.php CURL function for Google reCaptcha verification. Enable php_curl extension in php.ini configuration file.
<?php
function getCurlData($url)
{
$curl = curl_init();
curl_setopt($curl, CURLOPT_URL, $url);
curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($curl, CURLOPT_TIMEOUT, 10);
curl_setopt($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;
}
?>
db.php Database configuration file, modify username, password and database values.
<?php
define('DB_SERVER', 'localhost');
define('DB_USERNAME', 'username');
define('DB_PASSWORD', 'password');
define('DB_DATABASE', 'database');
$db = mysqli_connect(DB_SERVER,DB_USERNAME,DB_PASSWORD,DB_DATABASE);
?>


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