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if(isset($_POST['login'])) {
if(!isset($_POST['g-recaptcha-response']) || empty($_POST['g-recaptcha-response'])) {
echo 'reCAPTHCA verification failed, please try again.';
} else {
$secret = 'google_secret_key';
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, ''.$secret.'&response='.$_POST['g-recaptcha-response']);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
$response = curl_exec($ch);
$response = json_decode($response);
if($response->success) {
// What happens when the CAPTCHA was entered incorrectly
echo 'Successful login.';
} else {
// Your code here to handle a successful verification
echo 'reCAPTHCA verification failed, please try again.';
<!DOCTYPE html>
<html lang="en">
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>PHP reCAPTHCA</title>
<form method="POST">
<div class="g-recaptcha" data-sitekey="site_key"></div>
<input type="submit" name="login" value="Log in">
<script src="" async defer></script>
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