Google reCAPTCHA
-Step-01:
https://www.google.com/recaptcha/intro/invisible.html
Step-02
Step-03
SAMPLE CODE (index.php)
<!DOCTYPE html>
<html>
<head>
<title>Example reCaptcha</title>
<style type="text/css">
*{
font-family: arial;
font-size: 14px;
}
</style>
</head>
<?php
if(isset($_POST['submit'])){
$secret = "6LfH0iAUAAAAABr-Lbjauxl4MRMrPYI";
$response = $_POST["g-recaptcha-response"];
$remoteip = $_SERVER['REMOTE_ADDR'];
$URL = file_get_contents("https://www.google.com/recaptcha/api/siteverify?secret=$secret&response=$response&remoteip=$remoteip");
$result = json_decode($URL,TRUE);
if($result['success']==1){
print'<pre>';
print_r($URL);
print_r($result);
print_r($_POST['fullname']);
print'</pre>';
}
}
?>
<body>
<form method="post" action="">
Type Your Name : <input type="text" name="fullname"/><br/><br/>
<div class="g-recaptcha" data-sitekey="6LfH0iAUAAAAAO0eNlDLG0Ry8cutQSqf"></div><br/>
<input type="submit" name="submit"/>
</form>
<script src='https://www.google.com/recaptcha/api.js'></script>
</body>
</html>
Demo:
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