about three weeks later,i didnt have any time to check cpanel,just go to dashboard,add new tutorial and its done,one day i take alook to cpanel and i surprised with many spam comments,so i thought to add recaptcha to comments form,but because i am so busy i thought to take an easy way to do that.and as we said,

There is always an easy way to learn stuff, all you have to find out

after this i thought to teach you dude :)

in this tutorial you will learn the esy way to integrate recaptcha 2 service api  with codeigniter without need to extend any library or write more code,this task will make our site more secure by add it to codeigniter validation rules, lets do it

 

 

1-First step : get an api key for your site from google, you must have google account ,go to this link and fill form like image

2 - Step two : copy generated api key like this image

  

and put recaptcha input into your form  then put your api code into it,  then put api link above the same file

<script src='https://www.google.com/recaptcha/api.js'></script>


<div class="g-recaptcha" data-sitekey="Put_YOUR_GOOGLE_SITE_KEY_HERE"></div>

3- Step three : into your controller put this validation function

    function validate_captcha() {
        $captcha = $this->input->post('g-recaptcha-response');
         $response = file_get_contents("https://www.google.com/recaptcha/api/siteverify?secret=your secret key here &response=" . $captcha . "&remoteip=" . $_SERVER['REMOTE_ADDR']);
        if ($response . 'success' == false) {
            return FALSE;
        } else {
            return TRUE;
        }
    }

or you can use curl if file_get_contents not supported by your hosting provider like this

  function validate_captcha() {
        $recaptcha = trim($this->input->post('g-recaptcha-response'));
        $userIp= $this->input->ip_address();
        $secret='gfdgdgdgdgdg-bgSCYqSo-Y-vA';
        $data = array(
            'secret' => "$secret",
            'response' => "$recaptcha",
            'remoteip' =>"$userIp"
        );

        $verify = curl_init();
        curl_setopt($verify, CURLOPT_URL, "https://www.google.com/recaptcha/api/siteverify");
        curl_setopt($verify, CURLOPT_POST, true);
        curl_setopt($verify, CURLOPT_POSTFIELDS, http_build_query($data));
        curl_setopt($verify, CURLOPT_SSL_VERIFYPEER, false);
        curl_setopt($verify, CURLOPT_RETURNTRANSFER, true);
        $response = curl_exec($verify);
        $status= json_decode($response, true);
        if(empty($status['success'])){
            return FALSE;
        }else{
            return TRUE;
        }
    }

Then add this validation rule and validation message

$this->form_validation->set_rules('g-recaptcha-response', 'recaptcha validation', 'required|callback_validate_captcha');
$this->form_validation->set_message('validate_captcha', 'Please check the the captcha form');

And that is it,i hope it help you dude :)