HTML FORM
<form action="mail.php" method="post" enctype="multipart/form-data">
<input name="sender_name" placeholder="Your Name..."/>
<input name="sender_email" placeholder="Your email..."/>
<textarea placeholder="Your Message..." name="sender_message">
<div class="captcha_wrapper">
<div class="g-recaptcha" data-sitekey="YOUR_KEY"></div>
</div>
<button type="submit" id="send_message">Send Message!</button>
</form>
PHP Server-Side Script
<?php
$sender_name = stripslashes($_POST["sender_name"]);
$sender_email = stripslashes($_POST["sender_email"]);
$sender_message = stripslashes($_POST["sender_message"]);
$response = $_POST["g-recaptcha-response"];
$url = 'https://www.google.com/recaptcha/api/siteverify';
$data = array(
'secret' => 'YOUR_SECRET',
'response' => $_POST["g-recaptcha-response"]
);
$options = array(
'http' => array (
'method' => 'POST',
'content' => http_build_query($data)
)
);
$context = stream_context_create($options);
$verify = file_get_contents($url, false, $context);
$captcha_success=json_decode($verify);
if ($captcha_success->success==false) {
echo "<p>You are a bot! Go away!</p>";
} else if ($captcha_success->success==true) {
echo "<p>You are not not a bot!</p>";
}
