Com isso deduzo que esteja na reCaptchalib.php. Caso não esteja procure por privatekey, publickey

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agora que eu visualizei... Está faltando no config,php mesmo. Adicione $config['site']['privkey'] e $config['site']['pubkey']

ps: to no smarrtphone.

Editado Novembro 19, 2011 13 anos por gpedro (veja o histórico de edições)

está no reCaptchalib.php ae esta ele agr tem como dzer em que linha coloco \/

<?php

/*

* This is a PHP library that handles calling reCAPTCHA.

*    - Documentation and latest version

*		  http://recaptcha.net/plugins/php/

*    - Get a reCAPTCHA API Key

*		  http://recaptcha.net/api/getkey

*    - Discussion group

*		  http://groups.google.com/group/recaptcha

*

* Copyright (c) 2007 reCAPTCHA -- http://recaptcha.net

* AUTHORS:

*   Mike Crawford

*   Ben Maurer

*

* Permission is hereby granted, free of charge, to any person obtaining a copy

* of this software and associated documentation files (the "Software"), to deal

* in the Software without restriction, including without limitation the rights

* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell

* copies of the Software, and to permit persons to whom the Software is

* furnished to do so, subject to the following conditions:

*

* The above copyright notice and this permission notice shall be included in

* all copies or substantial portions of the Software.

*

* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE

* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER

* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,

* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN

* THE SOFTWARE.

*/

/**

* The reCAPTCHA server URL's

*/

define("RECAPTCHA_API_SERVER", "http://api.recaptcha.net");

define("RECAPTCHA_API_SECURE_SERVER", "https://api-secure.recaptcha.net");

define("RECAPTCHA_VERIFY_SERVER", "api-verify.recaptcha.net");

/**

* Encodes the given data into a query string format

* @param $data - array of string elements to be encoded

* @return string - encoded request

*/

function _recaptcha_qsencode ($data) {

	    $req = "";

	    foreach ( $data as $key => $value )

			    $req .= $key . '=' . urlencode( stripslashes($value) ) . '&';

	    // Cut the last '&'

	    $req=substr($req,0,strlen($req)-1);

	    return $req;

}

/**

* Submits an HTTP POST to a reCAPTCHA server

* @param string $host

* @param string $path

* @param array $data

* @param int port

* @return array response

*/

function _recaptcha_http_post($host, $path, $data, $port = 80) {

	    $req = _recaptcha_qsencode ($data);

	    $http_request  = "POST $path HTTP/1.0\r\n";

	    $http_request .= "Host: $host\r\n";

	    $http_request .= "Content-Type: application/x-www-form-urlencoded;\r\n";

	    $http_request .= "Content-Length: " . strlen($req) . "\r\n";

	    $http_request .= "User-Agent: reCAPTCHA/PHP\r\n";

	    $http_request .= "\r\n";

	    $http_request .= $req;

	    $response = '';

	    if( false == ( $fs = @fsockopen($host, $port, $errno, $errstr, 10) ) ) {

			    die ('Could not open socket');

	    }

	    fwrite($fs, $http_request);

	    while ( !feof($fs) )

			    $response .= fgets($fs, 1160); // One TCP-IP packet

	    fclose($fs);

	    $response = explode("\r\n\r\n", $response, 2);

	    return $response;

}

/**

* Gets the challenge HTML (javascript and non-javascript version).

* This is called from the browser, and the resulting reCAPTCHA HTML widget

* is embedded within the HTML form it was called from.

* @param string $pubkey A public key for reCAPTCHA

* @param string $error The error given by reCAPTCHA (optional, default is null)

* @param boolean $use_ssl Should the request be made over ssl? (optional, default is false)

* @return string - The HTML to be embedded in the user's form.

*/

function recaptcha_get_html ($pubkey, $error = null, $use_ssl = false)

{

if ($pubkey == null || $pubkey == '') {

  die ("To use reCAPTCHA you must get an API key from <a href='http://recaptcha.net/api/getkey'>http://recaptcha.net/api/getkey</a>");

}


if ($use_ssl) {

			    $server = RECAPTCHA_API_SECURE_SERVER;

	    } else {

			    $server = RECAPTCHA_API_SERVER;

	    }

	    $errorpart = "";

	    if ($error) {

		   $errorpart = "&amp;error=" . $error;

	    }

	    return '<script type="text/javascript" src="'. $server . '/challenge?k=' . $pubkey . $errorpart . '"></script>

<noscript>

    <iframe src="'. $server . '/noscript?k=' . $pubkey . $errorpart . '" 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>';

}



/**

* A ReCaptchaResponse is returned from recaptcha_check_answer()

*/

class ReCaptchaResponse {

	    var $is_valid;

	    var $error;

}


/**

  * Calls an HTTP POST function to verify if the user's guess was correct

  * @param string $privkey

  * @param string $remoteip

  * @param string $challenge

  * @param string $response

  * @param array $extra_params an array of extra variables to post to the server

  * @return ReCaptchaResponse

  */

function recaptcha_check_answer ($privkey, $remoteip, $challenge, $response, $extra_params = array())

{

if ($privkey == null || $privkey == '') {

  die ("To use reCAPTCHA you must get an API key from <a href='http://recaptcha.net/api/getkey'>http://recaptcha.net/api/getkey</a>");

}

if ($remoteip == null || $remoteip == '') {

  die ("For security reasons, you must pass the remote ip to reCAPTCHA");

}



	    //discard spam submissions

	    if ($challenge == null || strlen($challenge) == 0 || $response == null || strlen($response) == 0) {

			    $recaptcha_response = new ReCaptchaResponse();

			    $recaptcha_response->is_valid = false;

			    $recaptcha_response->error = 'incorrect-captcha-sol';

			    return $recaptcha_response;

	    }

	    $response = _recaptcha_http_post (RECAPTCHA_VERIFY_SERVER, "/verify",

										  array (

												 'privatekey' => $privkey,

												 'remoteip' => $remoteip,

												 'challenge' => $challenge,

												 'response' => $response

												 ) + $extra_params

										  );

	    $answers = explode ("\n", $response [1]);

	    $recaptcha_response = new ReCaptchaResponse();

	    if (trim ($answers [0]) == 'true') {

			    $recaptcha_response->is_valid = true;

	    }

	    else {

			    $recaptcha_response->is_valid = false;

			    $recaptcha_response->error = $answers [1];

	    }

	    return $recaptcha_response;

}

/**

* gets a URL where the user can sign up for reCAPTCHA. If your application

* has a configuration page where you enter a key, you should provide a link

* using this function.

* @param string $domain The domain where the page is hosted

* @param string $appname The name of your application

*/

function recaptcha_get_signup_url ($domain = null, $appname = null) {

return "http://recaptcha.net/api/getkey?" .  _recaptcha_qsencode (array ('domain' => $domain, 'app' => $appname));

}

function _recaptcha_aes_pad($val) {

$block_size = 16;

$numpad = $block_size - (strlen ($val) % $block_size);

return str_pad($val, strlen ($val) + $numpad, chr($numpad));

}

/* Mailhide related code */

function _recaptcha_aes_encrypt($val,$ky) {

if (! function_exists ("mcrypt_encrypt")) {

  die ("To use reCAPTCHA Mailhide, you need to have the mcrypt php module installed.");

}

$mode=MCRYPT_MODE_CBC;  

$enc=MCRYPT_RIJNDAEL_128;

$val=_recaptcha_aes_pad($val);

return mcrypt_encrypt($enc, $ky, $val, $mode, "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0");

}


function _recaptcha_mailhide_urlbase64 ($x) {

return strtr(base64_encode ($x), '+/', '-_');

}

/* gets the reCAPTCHA Mailhide url for a given email, public key and private key */

function recaptcha_mailhide_url($pubkey, $privkey, $email) {

if ($pubkey == '' || $pubkey == null || $privkey == "" || $privkey == null) {

  die ("To use reCAPTCHA Mailhide, you have to sign up for a public and private key, " .

	   "you can do so at <a href='http://mailhide.recaptcha.net/apikey'>http://mailhide.recaptcha.net/apikey</a>");

}

$ky = pack('H*', $privkey);

$cryptmail = _recaptcha_aes_encrypt ($email, $ky);


return "http://mailhide.recaptcha.net/d?k=" . $pubkey . "&c=" . _recaptcha_mailhide_urlbase64 ($cryptmail);

}

/**

* gets the parts of the email to expose to the user.

* eg, given johndoe@example,com return ["john", "example.com"].

* the email is then displayed as [email protected]

*/

function _recaptcha_mailhide_email_parts ($email) {

$arr = preg_split("/@/", $email );

if (strlen ($arr[0]) <= 4) {

  $arr[0] = substr ($arr[0], 0, 1);

} else if (strlen ($arr[0]) <= 6) {

  $arr[0] = substr ($arr[0], 0, 3);

} else {

  $arr[0] = substr ($arr[0], 0, 4);

}

return $arr;

}

/**

* Gets html to display an email address given a public an private key.

* to get a key, go to:

*

* http://mailhide.recaptcha.net/apikey

*/

function recaptcha_mailhide_html($pubkey, $privkey, $email) {

$emailparts = _recaptcha_mailhide_email_parts ($email);

$url = recaptcha_mailhide_url ($pubkey, $privkey, $email);


return htmlentities($emailparts[0]) . "<a href='" . htmlentities ($url) .

  "' onclick=\"window.open('" . htmlentities ($url) . "', '', 'toolbar=0,scrollbars=0,location=0,statusbar=0,menubar=0,resizable=0,width=500,height=300'); return false;\" title=\"Reveal this e-mail address\">...</a>@" . htmlentities ($emailparts [1]);

}


?>

Vai em htdocs/config/config.php

Procure esta linha:

$config['site']['verify_code'] = 1;

mude para:

$config['site']['verify_code'] = 0;

isso serve para desativar, pra arrumar o código tente isso:

va até a pasta do site e va na pasta config e abra o config.php e adicione isso depois de <?PHP

$config['site']['publickey'] = "6LfZAAoAAAAAALswKC2UCdCo_wf3ilh_C0qBhQJs "; // Public Key

$config['site']['privkey'] = "6LfZAAoAAAAAAA7_sZX1ZPomaqqTKBka5t6so0Un";; // Private Key

ae arrumo man vlw

Rep+ a todos