Hjælp med integrering af captcha i form

Mit bedste bud er at du skal bruge http://www.google.com/recaptcha
Det er en af de mest brugte på nettet, og den skulle vidst være ret nem at komme i gang med.

Du kan prøve og se om du kan få den til at virke selv, ellers så prøv at sende din form senere hen.

Tak for henvisningen, Pelle. Det var også Googles Captcha jeg gerne ville benytte mig af, så perfekt. Men nu har jeg siddet og leget med det i knap en time - og kan ikke få det til at køre intakt med mit system.

Kan du hjælpe?

Her er "kommentar-delen" af min side: nyhed.php

 <?
 if($_GET['opret'] == "ok") {
 if(!empty($_POST['kommentar'])) {
 $nyhedsid = $_POST["nyhedsid"];
 $kommentar = preg_replace("/<.*?>/", "", $_POST["kommentar"]);
 $brugernavn = $_SESSION["brugernavn"];
 $navn = $_POST["navn"];
 $dato = date("d-m-Y H:i:s");
 
 mysql_query("INSERT INTO `nyhedskommentarer` (nyhedsid, kommentar,  navn, dato) VALUES ('$nyhedsid', '$kommentar', '$navn', '$dato')") or die(mysql_error());
 echo "<meta http-equiv='refresh' content='0;url=nyhed.php?id=$nyhedsid'/>";
 } else {
 echo "Du skrev ikke nogen kommentar!";
 }
 }
 ?>
 
 
 <form action="?opret=ok" method="post">
 <?php>
 require_once('recaptchalib.php');
   $publickey = "6Ldzr8ISAAAAACQIq-kOcFGyqy3hYEA0h4ARhiag"; // you got this from the signup page
   echo recaptcha_get_html($publickey);
 ?>
 
 <input type="hidden" name="nyhedsid" value="<?=$vis[id]?>">
 Kommentar:<br>
 <textarea name="kommentar" cols="52" rows="5" value="Din kommentar til nyheden.."></textarea><br>
 
 
 <input  name="navn" size="18" value="Fornavn Efternavn" onfocus="if(this.value==this.defaultValue)this.value=''" onblur="if(this.value=='')this.value=this.defaultValue"  />   
    
 <input type="submit" value="Tilføj kommentaren!" name="submit" style="border:1px solid #000000; background:#ECECEC; width:280px;">
 
 
  
 </form>
 <?
 if (!empty($_GET['del'])) {
 $DeleteId = mysql_escape_string($_GET[del]);
 mysql_query("DELETE FROM nyhedskommentarer WHERE id = '$DeleteId'") or die(mysql_error());;
 echo "<meta http-equiv='refresh' content='0;url=nyhed.php?id=$nyhedsid'/>  ";
 }
 include "connect.php";
 $sql2 = mysql_query("SELECT * FROM nyhedskommentarer WHERE nyhedsid = '".$vis["id"]."' ORDER BY id DESC") or die(mysql_error());
 while ($showcomment = mysql_fetch_array($sql2)){
 ?>
 <table align="center" bgcolor="#FFFFFF" border="0" width="96%" cellpadding="0" cellspacing="5" style="border: 1px dotted #000000;" style="width: 96%">
 <tr>
 <td colspan="2"><div id="boks-text"><div id="boks-text"><b><?=$showcomment[navn]?></b> - <i>d. <?=$showcomment[dato]?></i>
 
 
 </div></td>
 </tr>
 <tr>
 
 <td><div id="boks-text"><?=$showcomment[kommentar]?></div>
 </td>
 </tr>
 </table><br>
 
 
 
 <?
 }
 ?>

Jeg skimmede lige din kode, men det kunne være rart lige at se "recaptchalib.php" - hvori jeg formoder at du laver det POST request der skal sendes til google for at verificere den.

Ydermere, hvad er det der ikke virker - kan du være mere specifik

Mit problem er, at jeg ikke kan få captcha'en til at køre i takt med mit system: få den til at afvise kommentaren (når jeg skriver forkert i captcha), og få den til at acceptere kommentaren når jeg lægger den ind, såvidt jeg har skrevet i korrekt i captcha.

Kort sagt, kan jeg ikke få den til at køre sammen med mit system..

Min "recaptchalib.php" er jo blot den fil, jeg får udleveret hos google.

Her er den:

 <?php
 /*
  * This is a PHP library that handles calling reCAPTCHA.
  *    - Documentation and latest version
  *          http://recaptcha.net/plugins/php/
  *    - Get a reCAPTCHA API Key
  *          https://www.google.com/recaptcha/admin/create
  *    - 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://www.google.com/recaptcha/api");
 define("RECAPTCHA_API_SECURE_SERVER", "https://www.google.com/recaptcha/api");
 define("RECAPTCHA_VERIFY_SERVER", "www.google.com");
 
 /**
  * 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='https://www.google.com/recaptcha/admin/create'>https://www.google.com/recaptcha/admin/create</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='https://www.google.com/recaptcha/admin/create'>https://www.google.com/recaptcha/admin/create</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, "/recaptcha/api/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 "https://www.google.com/recaptcha/admin/create?" .  _recaptcha_qsencode (array ('domains' => $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://www.google.com/recaptcha/mailhide/apikey'>http://www.google.com/recaptcha/mailhide/apikey</a>");
     }
     
 
     $ky = pack('H*', $privkey);
     $cryptmail = _recaptcha_aes_encrypt ($email, $ky);
     
     return "http://www.google.com/recaptcha/mailhide/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 john...@example.com
  */
 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://www.google.com/recaptcha/mailhide/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]);
 
 }
 
 
 ?>

Har du prøvet at kigge på det eksempel i PHP som Google selv har skrevet til brug af det?
http://code.google.com/intl/da/apis/recaptcha/docs/php.html

Kiggede den lige kort igennem, det så ret overskueligt ud

Pointen er lidt at du skal spørge Google "Er denne nøgle som brugeren har tastet ind, gyldig?" - Så svare den ja eller nej, og så kører du bare det du vil alt efter hvad svaret er.

Forstår ikke helt - er det dét der mailhide eksempel, du snakker om?

Nej, de 3 øverste farvede bokse med kode i.

Til og med overskriften "Server Side (How to test if the user entered the right answer)"

Dem har jeg skam smidt ind i mit system - jeg kan fortsat bare ikke få det til at kommunikere sammen..

Mangler du ikke at kalde recaptcha_check_answer et eller andet sted i din kode, f.eks. i toppen?

Hvilken kode skal jeg sætte ind som recaptcha_check_answer?

Jeg er ikke lige den bedste til programmering - og ligeså engelsk.