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Filename : Captchalib.php
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<?php

if (!defined('BASEPATH')) {
    exit('No direct script access allowed');
}

class Captchalib{
	public $CI;

	public function __construct(){
        $this->CI = &get_instance();
        $this->CI->load->helper('url');
        $this->CI->load->library('session');
        $this->CI->load->helper('captcha');
        $this->CI->load->model('captcha_model');
    }

     public function generate_captcha(){
        $captcha_config = array(
            'img_path'      => FCPATH.'backend/captcha_images/',
            'img_url'       => base_url().'backend/captcha_images/',
            'font_path'     => FCPATH.'system/fonts/texb.ttf',
            'img_width'     => '150',
            'img_height'    => 50,
            'word_length'   => 6,
            'font_size'     => 15,
            'expiration'    => 300,
            'colors'        => array(
               'background'     => array(143, 210, 153),
               'border'         => array(220, 255, 255),
               'text'           => array(0, 0, 0),
               'grid'           => array(53, 170, 71)
            )
        );
        $captcha = create_captcha($captcha_config);
        // Unset previous captcha and set new captcha word
        $this->CI->session->unset_userdata('captchaCode');
        $this->CI->session->set_userdata('captchaCode',isset($captcha["word"])?$captcha['word']:"");
        return $captcha;
    }

    public function is_captcha($login_page = null){
        $captcha = $this->CI->captcha_model->getStatus($login_page);
        if($login_page != null){
            if($captcha["status"]==1){
                return true;
            }else{
                return false;
            }
        }else{
            return false;
        }
    }

}