Integration of Google reCaptcha v2 in PHP Tutorial

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Inside this article we will see the concept of Integration of Google reCaptcha v2 in PHP Tutorial. Google reCAPTCHA is a CAPTCHA system that enables web hosts to distinguish between human and automated access to websites.

Tutorial will help you to understand the integration of google recaptcha v2 in PHP concept. This will be step by step guide article.

Google reCaptcha that provide security against hackers and sticks or curl requests. It assures that a computer user is a human. It is the best and most used captcha system available where users are only required to click on a checkbox and in some cases select some similar images related to conman question.

Learn More –

Let’s get started.

Create PHP Project

Go to your localhost directory.

Create a folder named as google-recaptcha-v2. Create two files inside it. Files are –

  • index.php -> This will display google captcha with form
  • process.php -> This will process form submission request

Google reCaptcha Credentials

Open browser and hit this link, it will need to login via your google account. Please login to create google recaptcha credentials.

You need to do these,

  • Label name
  • Select reCaptcha version type
  • Domain to be linked

Click on Submit

Copy your Site Key and Secret Key from here.

Application Programming

Open index.php file and write this code into it.

    <title>PHP Google reCAPTHA V2 Tutorial - Online Web Tutor</title>
    <link href="" rel="stylesheet" />
    <script src='' async defer></script>
    <div class="container" style="margin-top:50px;">
        <h3>PHP Google reCAPTHA V2 Tutorial - Online Web Tutor</h3>
        <form action="process.php" method="post">
            <div class="mb-3">
                <label for="exampleInputEmail1" class="form-label">Email address:</label>
                <input type="email" class="form-control" id="exampleInputEmail1" aria-describedby="emailHelp">
            <div class="mb-3">
                <label class="form-label">Comment:</label>
                <textarea class="form-control"></textarea>
            <div class="mb-3">
                <div class="g-recaptcha" data-sitekey="{GOOGLE-SITE-KEY}"></div>
            <div class="mb-3">
                <button type="submit" class="btn btn-primary">Submit</button>

Please replace {GOOGLE-SITE-KEY} your google recaptcha site key.

Open process.php and write this code into it.



    $recaptcha_secret = "{GOOGLE-SECRET-KEY}";
    $response = file_get_contents("" . $recaptcha_secret . "&response=" . $_POST['g-recaptcha-response']);
    $response = json_decode($response, true);

    if ($response["success"] === true) {
        echo "Form Submit Successfully.";
    } else {
        echo "You are a robot";

Please replace {GOOGLE-SECRET-KEY} your google recaptcha secret key.

Application Testing

Open application into browser.

URL: http://localhost/google-recaptcha-v2/

It will execute index.php and opens application as

When you put all input values and also submit google recaptcha then output will be like

Form Submit Successfully.

We hope this article helped you to learn Integration of Google reCaptcha v2 in PHP Tutorial in a very detailed way.

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Sanjay KumarHello friends, I am Sanjay Kumar a Web Developer by profession. Additionally I'm also a Blogger, Youtuber by Passion. I founded Online Web Tutor and Skillshike platforms. By using these platforms I am sharing the valuable knowledge of Programming, Tips and Tricks, Programming Standards and more what I have with you all. Read more