How to use reCaptcha in CodeIgniter

This is a widely used captcha implementation. It’s used at big sites like Facebook and CraigsList. I have some porblem to use that . But from the forum i get it very easily.
Here is the way to use reCaptcha helper in CodeIgniter.
Steps to Use
1. Sign up for an access key at
2. Get recaptchalib.php from the zip archive located at
3. Rename recaptchalib.php to recaptcha_helper.php and put it in your helpers folder.
4. Add the following function to recaptcha_helper.php:
function recaptcha() { $CI =& get_instance(); $CI->config->load('recaptcha'); $public_key = $CI->config->item('recaptcha_public_key'); $message = isset($CI->validation->recaptcha_error) ? $CI->validation->recaptcha_error : ''; return recaptcha_get_html($public_key, $message); }

5. Add the following function to your MY_Validation class as seen below in the libraries folder. (If you don’t already have one a MY_Validation class, make one.)

<?php if ( ! defined('BASEPATH')) exit('No direct script access allowed'); class MY_Validation extends CI_Validation { function MY_Validation() { parent::CI_Validation(); } function recaptcha_matches() { $CI =& get_instance(); $CI->config->load('recaptcha'); $public_key = $CI->config->item('recaptcha_public_key'); $private_key = $CI->config->item('recaptcha_private_key'); $response_field = $CI->input->post('recaptcha_response_field'); $challenge_field = $CI->input->post('recaptcha_challenge_field'); $response = recaptcha_check_answer($private_key, $_SERVER['REMOTE_ADDR'], $challenge_field, $response_field); if ($response->is_valid) { return TRUE; } else { $CI->validation->recaptcha_error = $response->error; $CI->validation->set_message('recaptcha_matches', 'The %s is incorrect. Please try again.'); return FALSE; } } }

5. Create a recaptcha.php in your config folder and add your public and private keys (the ones you got from registering) as seen below:

<?php if ( ! defined('BASEPATH')) exit('No direct script access allowed'); $config['recaptcha_public_key'] = "..."; $config['recaptcha_private_key'] = "...";

Example usage in a controller:

public function register() { $this->load->library('validation'); $this->load->helper('recaptcha'); $rules['username'] = 'trim|required|unique[users.username]'; $rules['password'] = 'required|password|matches[password_confirm]'; $rules['password_confirm'] = 'required'; $rules['email'] = 'trim|required|valid_email|unique[]'; $rules['recaptcha_challenge_field'] = 'required|recaptcha_matches'; $this->validation->set_rules($rules); $fields['username'] = 'username'; $fields['password'] = 'password'; $fields['password_confirm'] = 'password confirmation'; $fields['email'] = 'email'; $fields['recaptcha_challenge_field'] = 'answer to the security question'; $this->validation->set_fields($fields); if ($this->validation->run() == FALSE) { $this->load->view('user_registration'); } else { echo 'Success!'; } }

In the view, you can create the captcha form element by echoing <?= recaptcha() ?> I can package all of this into a zip file upon request. Here is the original link .

  1. This is useful for me. Thanks a lot!

  2. Thanks A lot brother, you really help me

  3. thanks bro

    • Muthuraj
    • June 18th, 2009

    Sir I tried your code but I cant get the answer i didn’t know what mistake that I have done, so can you please send me that zip file package, I think it may be useful for me.

    • Faruque
    • July 6th, 2009

    Brother, Please send package into a zip file.
    i will be very grateful to you

  4. For implement captcha in a codeigniter app, you first need to create model, view and controller, like done here: However, you haven’t created any of that in your tutorial. Is this an alternate method of adding captcha?

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