Step 1: Register your website on Google reCAPTCHA
To start the process, you need to register your website on Google reCAPTCHA. Go to https://www.google.com/recaptcha/admin and add your website.
You will be returned a set of keys like something below.
Site key Use this in the HTML code your site serves to users. 6Lc4-XXXXXXXXXX-XXXXXXXXXX Secret key Use this for communication between your site and Google. Be sure to keep it a secret. 6Lc4-YYYYYYYYYY-YYYYYYYYYY
Step 2: Adding the code to your website
<?php
$site_key = "6Lc4-XXXXXXXXXX-XXXXXXXXXX";
$recaptcha_secret = "6Lc4-YYYYYYYYYY-YYYYYYYYYY";
?>
<html>
<head>
<title>Google reCAPTCHA Demo</title>
</head>
<body>
<form method="post" action="index.php">
Enter your website: <input type="text" name="website" id="website" placeholder="https://www.shounakgupte.com" required /> <input type="submit" value="Submit">
<div class="g-recaptcha" data-sitekey="<?php echo $site_key; ?>"></div>
</form>
<script src='https://www.google.com/recaptcha/api.js'></script>
</body>
</html>
<?php
if($_REQUEST['website']){
//verify captcha
$response = file_get_contents("https://www.google.com/recaptcha/api/siteverify?secret=".$recaptcha_secret."&response=".$_POST['g-recaptcha-response']);
$response = json_decode($response, true);
if($response["success"] === true)
{
//not a robot
}
else
{
//you are a robot
}
}
