How to add google captcha in PHP form
1- Generate reCAPTCHA API Keys
Register your website at – Google reCAPTCHA Admin console.
2- Get the site Key and secret Key:
- Site Key – This key is used in the HTML code of the reCAPTCHA.
- Secret Key – This key helps to authorize communication between your site and the reCAPTCHA server.
<script src='https://www.google.com/recaptcha/api.js' async defer ></script>
index.php
<html>
<head>
<meta charset="utf-8">
<title>Google reCAPTCHA in PHP</title>
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.5.2/css/bootstrap.min.css">
</head>
<body>
<div class="container mt-5">
<h2>Google reCAPTCHA in PHP Contact Form</h2>
<!-- Contact form -->
<form action="varify_captcha.php" name="contactForm" method="post" enctype="multipart/form-data">
<div class="form-group">
<label>Name</label>
<input type="text" class="form-control" name="name" required>
</div>
<div class="form-group">
<label>Phone</label>
<input type="text" class="form-control" name="subject" required>
</div>
<div class="form-group">
<!-- Google reCAPTCHA block -->
<div class="g-recaptcha" data-sitekey="6LfZ4AAVAAAAAFP6tyNYWgycDvXHIfjZg9shDZ05"></div>
</div>
<div class="form-group">
<input type="submit" name="send" value="Send" class="btn btn-primary btn-block">
</div>
</form>
</div>
<!-- Google reCaptcha -->
<script src="https://www.google.com/recaptcha/api.js" async defer></script>
</body>
</html>
varify_captcha.php
<?php
if(!empty($_POST['g-recaptcha-response']))
{
$secret = 'GOOGLE_CAPTACH_SECRET_KEY';
$verifyResponse = file_get_contents('https://www.google.com/recaptcha/api/siteverify?secret='.$secret.'&response='.$_POST['g-recaptcha-response']);
$responseData = json_decode($verifyResponse);
if($responseData->success)
$message = "g-recaptcha varified successfully";
else
$message = "Some error in vrifying g-recaptcha";
echo $message;
}
?>