Verifying the User's Answer Without Plugins reCAPTCHA

so i am trying to get recaptcha work with my form. This is the code i have for the form.

<form action="" method="post">
 <input type="text" name="text4" id="text4" style="width:400px" /><br/><br/>' . '<script type="text/javascript"
   src="http://www.google.com/recaptcha/api/challenge?k=XXXXXXXXXXXXXXXXXX">
</script>
&l开发者_高级运维t;noscript>
   <iframe src="http://www.google.com/recaptcha/api/noscript?k=XXXXXXXXXXXXXXXXXX"
       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="button" value="Submit"/>

I'm trying to use the recaptcha without plugins. It was easy to make it show but I'm having a really hard time verify the input. Anyone know how to the the verify without plugin part? Greatly appreciate it.

Your server side code, to get reCaptcha to work, should be something similar to what's posted here:

• http://wiki.recaptcha.net/index.php/Overview#Server_Side_.28How_to_test_if_the_user_entered_the_right_answer.29

There's no way to get reCaptcha to work, without using a solution similar to this, in any server-side language. Here is the code:

require_once('recaptchalib.php');
$privatekey = "your_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 . ")" );
} else {
    // Your code here to handle a successful verification
}