iflrandevu/src/application/controllers/Captcha.php

<?php if ( ! defined('BASEPATH')) exit('No direct script access allowed');

/* ----------------------------------------------------------------------------
 * Easy!Appointments - Open Source Web Scheduler
 *
 * @package     EasyAppointments
 * @author      A.Tselegidis <alextselegidis@gmail.com>
 * @copyright   Copyright (c) 2013 - 2017, Alex Tselegidis
 * @license     http://opensource.org/licenses/GPL-3.0 - GPLv3
 * @link        http://easyappointments.org
 * @since       v1.0.0
 * ---------------------------------------------------------------------------- */

/**
 * Captcha Controller
 *
 * @package Controllers
 */
class Captcha extends CI_Controller {
    /**
     * Class Constructor
     */
    public function __construct() {
        parent::__construct();
        $this->load->library('session');
    }

    /**
     * Make a request to this method to get a captcha image.
     */
    public function index() {
        header('Content-type: image/jpeg');
        $builder = new Gregwar\Captcha\CaptchaBuilder;
        $builder->build();
        $this->session->set_userdata('captcha_phrase', $builder->getPhrase());
        $builder->output();
    }
}