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Adding Captcha in Forms in CodeIgniter Website: https://www.cloudways.com/blog/captcha-in-codeigniter/
<?php
defined('BASEPATH') OR exit('your exit message');
class Captcha extends CI_Controller
{
   function __construct()
   {
       parent::__construct();
       $this->load->helper('captcha');
   }
   public function index()
   {
       if ($this->input->post('submit')) {
           $captcha_insert = $this->input->post('captcha');
           $contain_sess_captcha = $this->session->userdata('valuecaptchaCode');
           if ($captcha_insert === $contain_sess_captcha) {
               echo 'Success';
           } else {
               echo 'Failure';
           }
       }
       $config = array(
           'img_url' => base_url() . 'image_for_captcha/',
           'img_path' => 'image_for_captcha/',
           'img_height' => 45,
           'word_length' => 5,
           'img_width' => '45',
           'font_size' => 10
       );
       $captcha = create_captcha($config);
       $this->session->unset_userdata('valuecaptchaCode');
       $this->session->set_userdata('valuecaptchaCode', $captcha['word']);
       $data['captchaImg'] = $captcha['image'];
       $this->load->view('captcha/index', $data);
   }
   public function refresh()
   {
       $config = array(
           'img_url' => base_url() . 'image_for_captcha/',
           'img_path' => 'image_for_captcha/',
           'img_height' => 45,
           'word_length' => 5,
           'img_width' => '45',
           'font_size' => 10
       );
       $captcha = create_captcha($config);
       $this->session->unset_userdata('valuecaptchaCode');
       $this->session->set_userdata('valuecaptchaCode', $captcha['word']);
       echo $captcha['image'];
   }
}
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