form.php
<html>
<body>
<form method="post" action="verify.php">
<?php
require_once('recaptchalib.php');
$publickey = "6LecdRYUAAAAAD3W0PGhRENtLV6qNHlvwCekxTZB"; // Public Key
echo recaptcha_get_html($publickey);
?>
<input type="submit" />
</form>
</body>
</html>verify.php
<?php
require_once('recaptchalib.php');
$privatekey = "6LecdRYUAAAAAB9onGAL2HDhVadT2T_CQKHlOOB-"; // Private Key
$resp = recaptcha_check_answer ($privatekey,
$_SERVER["REMOTE_ADDR"],
$_POST["recaptcha_challenge_field"],
$_POST["recaptcha_response_field"]);
if (!$resp->is_valid) {
// What happens when the CAPTCHA was entered incorrectly
//die ("The reCAPTCHA wasn't entered correctly. Go back and try it again." .
// "(reCAPTCHA said: " . $resp->error . ")");
echo "<font color='red'>Captcha Invalid code</font>";
} else {
echo "<font color='green'>Congratulations</font>";
}
?>