Trying to build the simplest codeigniter captcha according to the codeignuter help instructions but it dosen't work - codeigniter

Question

Trying to build the simplest codeigniter captcha according to the codeigniter help instructions but it dosen't work.
My controller:
<?php if ( ! defined('BASEPATH')) exit('No direct script access allowed');
class c_captche extends CI_Controller {
//http://stackoverflow.com/questions/9484480/couldnt-connect-to-helper-in-codeigniter
//https://www.youtube.com/watch?v=TU_8b9SRe_k
//https://www.youtube.com/watch?v=tAmAxdSGZSs
/*
http://ellislab.com/codeigniter/user-guide/helpers/captcha_helper.html
https://www.youtube.com/watch?v=RR3ODc0vDvA
http://only4ututorials.blogspot.in/2014/04/how-to-create-captcha-with-codeigniter.html
http://www.cecilieo.com/techblog/how-to-use-codeigniter-captcha-plug-in/
*/
public function __construct()
{
parent::__construct();
$this->load->library('image_lib') ;
//$this->load->helper(array('captche'));
$this->load->helper('captcha');
}
public function index() {
echo "in c_captche";
$data = array(
'word' => 'Random word',
'img_path' => './captcha/',
'img_url' => base_url().'application/captcha/',
'img_width' => '150',
'img_height' => 30,
'expiration' => 7200
);
$captch=create_captcha( $data);
print_r($captch);
$this->load->view('v_captche',$captch);
}
}
My view:
<?php
print_r($captch);
echo $captch ;
?>
I created folder called captcha under application folder.
No image been created there.
The error msg i get is:
PHP Error was encountered
Severity: Notice
Message: Undefined variable: captch
Filename: views/v_captche.php
Line Number: 8
A PHP Error was encountered
Severity: Notice
Message: Undefined variable: captcha
Filename: views/v_captche.php
Line Number: 9
But even before the error msg, no img is been created in the folder.

Answer 1

As said in the documentation :
The "captcha" folder must be writable (666, or 777)
So check your folder rights, and you have to create this folder at your index.php root.
Then, for your view, you should use :
$this->load->view('v_captche',array('captcha' => $captch));
And in your view :
print_r($captcha);
echo $captcha['image'];