[HOW TO] [UPDATED] Installing Recaptcha TESTED ON 1.4.7

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function recaptcha_get_html ($pubkey, $error = null, $use_ssl = false)
{
	if ($pubkey == null || $pubkey == 'HERE INSERT YOUR PUBLIC KEY') {
		die ("To use reCAPTCHA you must get an API key from <a href='http://recaptcha.net/api/getkey'>http://recaptcha.net/api/getkey</a>");
	}

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

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

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function recaptcha_check_answer ($privkey, $remoteip, $challenge, $response, $extra_params = array())
{
	if ($privkey == null || $privkey == 'HERE INSERT YOUR PRIVATE KEY') {
		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");
	}

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 		if (isset($this->error['captcha'])) {
			$this->data['error_captcha'] = $this->error['captcha'];
		} else {
			$this->data['error_captcha'] = '';
		}

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		if (isset($this->request->post['captcha'])) {
			$this->data['captcha'] = $this->request->post['captcha'];
		} else {
			$this->data['captcha'] = '';
		}	

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	public function captcha() {
		$this->load->library('captcha');
		
		$captcha = new Captcha();
		
		$this->session->data['captcha'] = $captcha->getCode();
		
		$captcha->showImage();
	}
  }

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	public function recaptcha() {

 require_once('/system/library/recaptchalib.php');
 $privatekey = "HERE INSERT 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
   }
}

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    	if (!isset($this->session->data['captcha']) || ($this->session->data['captcha'] != $this->request->post['captcha'])) {
      		$this->error['captcha'] = $this->language->get('error_captcha');
    	}

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              <input type="text" name="captcha" value="<?php echo $captcha; ?>" />
              <?php if ($error_captcha) { ?>
              <span class="error"><?php echo $error_captcha; ?></span>
              <?php } ?>
              <br />
              <img src="index.php?route=information/contact/captcha" /></td>

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      <div id="recaptcha_div"></div><nowiki><br>
      <input type="button" value="Show reCAPTCHA" onclick="showRecaptcha('recaptcha_div');"></input>
      <br><nowiki></td>

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<?php echo $footer; ?>

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     <script type="text/javascript" src="catalog/view/javascript/recaptcha_ajax.js"></script>

     <!-- Wrapping the Recaptcha create method in a javascript function -->
     <script type="text/javascript">
        function showRecaptcha(element) {
          Recaptcha.create("HERE INSERT YOUR PUBLIC KEY", element, {
            theme: "red", 
            callback: Recaptcha.focus_response_field});
        }
     </script>

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	public function captcha() {
		$this->load->library('captcha');
		
		$captcha = new Captcha();
		
		$this->session->data['captcha'] = $captcha->getCode();
		
		$captcha->showImage();
	}
  }

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	public function recaptcha() {

 require_once('/system/library/recaptchalib.php');
 $privatekey = "YOUR PRIVATE KEY HERE";
 $resp = recaptcha_check_answer ($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
    }
}

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    	if ($this->session->data['captcha'] != $this->request->post['captcha']) {
      		$this->error['message'] = $this->language->get('error_captcha');
    	}

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        <input type="text" name="captcha" value="" />
        <br />
        <img src="index.php?route=product/product/captcha" id="captcha" /></div>

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       <div id="recaptcha_div"></div><nowiki><br>
      <input type="button" value="Show reCAPTCHA" onclick="showRecaptcha('recaptcha_div');"></input>
      <br><nowiki>

        <br />

        </div>

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<?php echo $footer; ?>

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     <script type="text/javascript" src="catalog/view/javascript/recaptcha_ajax.js"></script>

     <!-- Wrapping the Recaptcha create method in a javascript function -->
     <script type="text/javascript">
        function showRecaptcha(element) {
          Recaptcha.create("HERE INSERT YOUR PUBLIC KEY", element, {
            theme: "red", 
            callback: Recaptcha.focus_response_field});
        }
     </script>

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     <script type="text/javascript" src="catalog/view/javascript/recaptcha_ajax.js"></script>

     <!-- Wrapping the Recaptcha create method in a javascript function -->
     <script type="text/javascript">
        function showRecaptcha(element) {
          Recaptcha.create("", element, {
            theme: "HERE INSERT YOUR COLOUR",   
            callback: Recaptcha.focus_response_field});
        }
     </script>

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// Your code here to handle a successful verification

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if (isset($this->request->post['captcha'])) {
    $this->data['captcha'] = $this->request->post['captcha'];
} else {
    $this->data['captcha'] = '';
}
 

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$this->load->library('recaptchalib');
$publicKey = "YOUR_PUB_KEY";
$privateKey = "YOUR_PRIV_KEY";        
$this->data['captcha_show'] = recaptcha_get_html($publicKey,$this->data['error_captcha']);
 

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public function captcha() {
    $this->load->library('captcha');
    
    $captcha = new Captcha();
    
    $this->session->data['captcha'] = $captcha->getCode();
    
    $captcha->showImage();
}
 

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if (!isset($this->session->data['captcha']) || ($this->session->data['captcha'] != $this->request->post['captcha'])) {
          $this->error['captcha'] = $this->language->get('error_captcha');
}
 

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if (isset($this->request->post['recaptcha_challenge_field'])) {
    $this->load->library('recaptchalib');
    $publicKey = "YOUR_PUB_KEY";
        $privateKey = "YOUR_PRIV_KEY";
    $resp = recaptcha_check_answer ($privateKey,
                                    $_SERVER["REMOTE_ADDR"],
                                    $this->request->post["recaptcha_challenge_field"],
                                    $this->request->post["recaptcha_response_field"]);
    if (!$resp->is_valid) {
        $this->error['captcha'] = "Captcha was incorrect, try again";
    }
} else {
    $this->error['captcha'] = "No CAPTCHA entered";
}
 

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Notice: Undefined index: error_captcha in /web/htdocs/*/*/*/catalog/controller/information/contact.php  on line 75To use reCAPTCHA you must get an API key from http://recaptcha.net/api/getkey

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     if (isset($this->request->post['captcha'])) {
         $this->data['captcha'] = $this->request->post['captcha'];
      } else {
         $this->data['captcha'] = '';
      }

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		// RECAPTCHA
		if (isset($this->request->post['recaptcha_response_field'])) {
			$this->data['captcha_response'] = $this->request->post['recaptcha_response_field'];
		} else {
			$this->data['captcha_response'] = '';
		}		
		
		if (isset($this->request->post['recaptcha_challenge_field'])) {
			$this->data['captcha_challenge'] = $this->request->post['recaptcha_challenge_field'];
		} else {
			$this->data['captcha_challenge'] = '';
		}		

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   public function captcha() {
      $this->load->library('captcha');
      
      $captcha = new Captcha();
      
      $this->session->data['captcha'] = $captcha->getCode();
      
      $captcha->showImage();
   }
  }

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	private function recaptcha() {
/* 	recaptchalib.php needs to be in system/library/ */
		$this->load->library('recaptchalib');
		
		// Get a key from https://www.google.com/recaptcha/admin/create
		$publickey = "YOUR PUBLIC KEY";
		$privatekey = "YOUR PRIVATE KEY";
		
		# the response from reCAPTCHA
		$resp = null;
		# the error code from reCAPTCHA, if any
		$error = null;
		
		# was there a reCAPTCHA response?
		if ($this->request->post['recaptcha_response_field']) {
	        $resp = recaptcha_check_answer ($privatekey,
	                                        $_SERVER["REMOTE_ADDR"],
	                                        $this->request->post['recaptcha_challenge_field'],
	                                        $this->request->post['recaptcha_response_field']);
	
	        if ($resp->is_valid) {
	                return TRUE;
	        } else {
	                return FALSE;
	        }
		} else {
			return FALSE;
		}
		return FALSE;
	}

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       if (!isset($this->session->data['captcha']) || ($this->session->data['captcha'] != $this->request->post['captcha'])) {
            $this->error['captcha'] = $this->language->get('error_captcha');
       }

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    	if (!$this->recaptcha()) {
			$this->error['captcha'] = $this->language->get('error_captcha');
    	}

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              <input type="text" name="captcha" value="<?php echo $captcha; ?>" autocomplete="off" />
              <?php if ($error_captcha) { ?>
              <span class="error"><?php echo $error_captcha; ?></span>
              <?php } ?>
              <br />
              <img src="index.php?route=information/contact/captcha" /></td>

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	<script type="text/javascript" src="http://www.google.com/recaptcha/api/challenge?k=YOUR PUBLIC KEY"></script>
	<noscript> 
  		<iframe src="http://www.google.com/recaptcha/api/noscript?k=YOUR PUBLIC KEY" 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>
<?php if ($error_captcha) { ?>
	<span class="error"><?php echo $error_captcha; ?></span>
<?php } ?>

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  <div class="middle">

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    <div style="width: 100%; margin-bottom: 30px;">

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   <script type="text/javascript">
	<!-- Set RECAPTCHA theme settings below :
		var RecaptchaOptions = {
			theme : 'clean',
		};
	//-->
	</script>

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         if (isset($this->request->post['captcha'])) {
             $this->data['captcha'] = $this->request->post['captcha'];
          } else {
             $this->data['captcha'] = '';
          }