Thursday, January 13, 2011
Using recaptcha in PHP in localhost
Reference:
http://code.google.com/apis/recaptcha/docs/display.html
reCAPTCHA Library for PHP - v1.11
reCAPTCHA quick start
A CAPTCHA is a program that can tell whether its user is a human or a computer. reCAPTCHA is a free CAPTCHA service.
1. go to
https://www.google.com/recaptcha/admin/create?app=php
type localhost (select is not important here.)
click create key to get public key and private key.
2. Download reCAPTCHA library, I put it under directory recaptcha-php-1.11 in my test directory
3. test_rec.html (replace the key after k= to your public key)
<html>
<script type= "text/javascript">
var RecaptchaOptions = {
theme: 'clean'
};
</script>
<body> <!-- the body tag is required or the CAPTCHA may not show on some browsers -->
<!-- your HTML content -->
<form method="post" action="verify.php">
<script type="text/javascript"
src="http://www.google.com/recaptcha/api/challenge?k=6LcfdsASAAAAAIse5zmAapM1Tcx-xedplk6MjvBF">
</script>
<noscript>
<iframe src="http://www.google.com/recaptcha/api/noscript?k=6LcfdsASAAAAAIse5zmAapM1Tcx-xedplk6MjvBF"
height="300" width="500" frameborder="0"></iframe><br>
<textarea name="recaptcha_challenge_field" rows="3" cols="40">
</textarea>
<input type="hidden" name="recaptcha_response_field"
value="manual_challenge">
</noscript>
<input type="submit" />
</form>
<!-- more of your HTML content -->
</body>
</html>
4. verify.php
<?php
ini_set('display_errors', 1);
error_reporting(E_ALL);
require_once('recaptcha-php-1.11/recaptchalib.php');
//localhost
$privatekey = "6LcfdsASAAAAAPSluWN47bx8I_dwfYC_ggMx0gt9 ";
$resp = recaptcha_check_answer ($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 . ")");
} else {
echo " test successfully";
// Your code here to handle a successful verification
}
?>
5. A demo:
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