<?php require_once 'recaptcha.class.php'; $site_key = 'YOUR_SITE_KEY'; $secret_key = 'YOUR_SECRET_KEY'; $recaptcha = new Recaptcha($site_key, $secret_key); ?> <!doctype html> <html> <head> <title>reCaptcha 2.0 API Class</title> <?php echo $recaptcha->script(); ?> </head> <body> <?php ob_start(); ?> <form method="post"> <input type="text" name="example" value="" placeholder="Example Field" /> <?php echo $recaptcha->captcha(); ?> <input type="submit" value="Submit" /> </form> <?php $form = ob_get_clean();