In this tutorial I will be showing you how to implement Google's reCAPTCHA in your forms. reCAPTCHA is the latest version of the CAPTCHA visual cookie. It is meant to stop spammers from using spam bots to spam your forms. A very simple aid, here is how you can implement it! 

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How to implement?

1. An API key is required so go to reCAPTCHA's official site while logged into your Google account. Fill in your site's domain name and your reCAPTCHA version. Click Register

2. You shall be given a Site key and a Secret key. Keep them with you. 

3. Type <script src='https://www.google.com/recaptcha/api.js'></script> below your form (just below the closing form tag)

4. Place <div class="g-recaptcha" data-sitekey="xyz"></div> where you want your reCAPTCHA field to appear. NOTE: Replace 'xyz' with the Site Key Google gave you.

5. Now we have the basic structure so let's start building the verification. Save your form as index.php

6. Start placing PHP code at the bottom of the page. 

<?php

  foreach ($_POST as $key => $value) {

    echo '<p><strong>' . $key.':</strong> '.$value.'</p>';

  }

?>​

7.    Go to Google's Official reCAPTCHA library on GitHub and save the file in your site's root folder.

8.    Now add the following PHP code in your site. NOTE: Replace 'xyz' with your Secret Key.

<?php

// grab recaptcha library

require_once "recaptchalib.php";

​

// your secret key

$secret = "xyz";

​

// empty response

$response = null;

​

// check secret key

$reCaptcha = new ReCaptcha($secret);

​

// if submitted check response

if ($_POST["g-recaptcha-response"]) {

    $response = $reCaptcha->verifyResponse(

        $_SERVER["REMOTE_ADDR"],

        $_POST["g-recaptcha-response"]

    );

}

?>

<?php

  if ($response != null && $response->success) {

    echo "Hi " . $_POST["name"] . " (" . $_POST["email"] . "), thanks for submitting the form!";

  } else {

?>

<?php } ?>

​

9. Now save your file and run it. reCAPTCHA should now be working! Congratulations!