Google Invisible RECAPTCHA With PHP Example

Jun 30, 2021



Google Invisible RECAPTCHA With PHP Example

Hi guys,

Today i will explained how to set google invisible rechaptcha in php. This example is so easy to use in php.

THis example to first create a google rechapataGoogle reCAPTCHA Admin. Thorough create a your site key and secret key. Then later to working this example.

So let's start to the example.



// Google reCaptcha secret key

$secretKey = "6Lc9g2YbAAAAAE26RWGT7yVHVprsGM3zuLhZGTqO";

$statusMsg = '';


if(isset($_POST['captcha-response']) && !empty($_POST['captcha-response'])){

// Get verify response data

$verifyResponse = file_get_contents(''.$secretKey.'&response='.$_POST['captcha-response']);

$responseData = json_decode($verifyResponse);


$name = !empty($_POST['name']?$_POST['name']:'');

$email = !empty($_POST['email']?$_POST['email']:'');

$message = !empty($_POST['message']?$_POST['message']:'');

$contactFormStatus = array(

'type' => 'success',

'msg' => 'your contact request have submitted successfully.'



$contactFormStatus = array(

'type' => 'error',

'msg' => 'Robot verification failed, please try again.'




$contactFormStatus = array(

'type' => 'error',

'msg' => 'Robot verification failed, please try again.'





<!DOCTYPE html>




body {font-family: Arial, Helvetica, sans-serif;}

* {box-sizing: border-box;}

input[type=text],input[type=email], select, textarea {

width: 100%;

padding: 12px;

border: 1px solid #ccc;

border-radius: 4px;

box-sizing: border-box;

margin-top: 6px;

margin-bottom: 16px;

resize: vertical;


input[type=submit] {

background-color: #04AA6D;

color: white;

padding: 12px 20px;

border: none;

border-radius: 4px;

cursor: pointer;


input[type=submit]:hover {

background-color: #45a049;


.container {

border-radius: 5px;

background-color: #f2f2f2;

padding: 20px;





<h3>Contact Form</h3>



echo '<p class="'.$contactFormStatus['type'].'">'.$contactFormStatus['msg'].'</p>';



<div class="container" style="width: 500px;">

<form action="" method="post">

<label for="fname">First Name</label>

<input type="text" id="fname" name="firstname" placeholder="Your name..">

<label for="email">Email</label>

<input type="email" id="email" name="email" placeholder="Your email..">

<label for="message">Subject</label>

<textarea id="message" name="message" placeholder="Type your message here...." style="height:200px"></textarea>

// data-sitekey = Google reCaptcha site key

<div class="g-recaptcha" data-sitekey="6Lc9g2YbAAAAAP1jTGzUwMek7GKy6chBnhzpu4ob" data-badge="inline" data-size="invisible" data-callback="setResponse"></div>

<input type="hidden" id="captcha-response" name="captcha-response" />

<input type="submit" name="submit" value="SUBMIT" style="margin-top: 8px;">



<script src="" async defer></script>


var onloadCallback = function() {



function setResponse(response) {

document.getElementById('captcha-response').value = response;





now you can check your own.

i hope it can help you...

#PHP 8