<form method="post" action="">
 
<?php
 
    include('recaptcha.class.php');
 
    
 
    $captcha    =    new Recaptcha;
 
    $captcha->publicKey        =    "your public API key";
 
    $captcha->privateKey    =    "your private API key";
 
 
    if(isset($_POST) AND !empty($_POST)){
 
        $captcha->checkCaptcha();
 
        $debug    =    $captcha->getError();    
 
        if(!$debug){
 
            echo 'All right';
 
        }
 
        else{
 
            echo $debug;
 
        }
 
    }
 
    
 
    echo $captcha->getCaptcha();
 
?>
 
<input type="submit" value="Check captcha" />
 
</form>
 
 
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