Google reCAPTCHA V3 Implementation in PHP

4 Replies to “Google reCAPTCHA V3 Implementation in PHP”

1. Pingback: 2 Easy steps to add captcha to Contact Form 7 - Learn and Share

2. Chirag, the problem was my test server, works fine on production server; apparently have an issue in my openSSL implementation. Thanks again, you rock!

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   1. Hi Carlo

      Thanks for the updates and figure out the issue. As a programmer, I can also suggest one thing to keep the habit to print the response of the API when you face any issue. It’ll give you more ideas about the bug and helping to find the solutions. In the tutorial, you can use the PHP function print_r to print the response getting from the server.
      *Example:* print_r($captcha_response)

      Thanks,
      Chirag

      Reply

3. Hi man, thank you very much for the tutorial, it has been really helpful for me to understand how to implement this feature in my website.

   If you don’t mind I want to ask for your help because I’ve tried to implement the code using my localhost but I’m using TWO files instead of one and I’m having troubles get the response for the API.

   The first file is the form itself in which I’ve added in the header:

   Then a hidden tag inside my form:

   And the script file at the bottom of the page:

   grecaptcha.ready(function() {
   grecaptcha.execute(‘_MY_SITE_KEY_’, {action: ‘homepage’}).then(function(token) {
   console.log(token);
   document.getElementById(“hdn_recaptcha_token”).value = token;
   });
   });

   And the second file have server side validations, but before make those local DB validations I’ve added your code:
   if(isset($_POST) && isset($_POST[‘hdn_recaptcha_token’])) {
   $captcha_secret_key = “MY_SECRET_KEY_STRING”;
   $captcha_client_key = $_POST[‘hdn_recaptcha_token’];
   $captcha_client_ip = $_SERVER[‘REMOTE_ADDR’];

   $captcha_url = “https://www.google.com/recaptcha/api/siteverify?”;
   $captcha_data = array(
   ‘secret’ => $captcha_secret_key,
   ‘response’ => $captcha_client_key,
   ‘remoteip’=> $captcha_client_ip
   );

   $captcha_options = array(
   ‘http’ => array(
   ‘method’ => ‘POST’,
   ‘content’ => http_build_query($captcha_data)
   )
   );

   $captcha_context = stream_context_create($captcha_options);
   $captcha_result = file_get_contents($captcha_url, false, $captcha_context);
   $captcha_response = json_decode($captcha_result);

   if($captcha_response -> success)
   {
   echo ‘Validation Success!’;
   } else {
   echo ‘Captcha Validation Failed..!’;
   }
   }

   But apparently I’m not getting the response from API google, so, I was wondering if you can see where’s the error in the code.

   Thanks in advance,
   –Carlo

   Reply