Create file inside applicaiton/core folder with the name MY_Router.php and place below code inside it and it will work :--
Note : This solution is for Codeigniter 2.2.0
<?php
Class MY_Router extends CI_Router
{
Function MY_Router()
{
parent::CI_Router();
}
function _validate_request($segments)
{
if (file_exists(APPPATH.'controllers/'.$segments[0].EXT))
{
return $segments;
}
if (is_dir(APPPATH.'controllers/'.$segments[0]))
{
$this->set_directory($segments[0]);
$segments = array_slice($segments, 1);
/* ----------- ADDED CODE ------------ */
while(count($segments) > 0 && is_dir(APPPATH.'controllers/'.$this->directory.$segments[0]))
{
// Set the directory and remove it from the segment array
$this->set_directory($this->directory . $segments[0]);
$segments = array_slice($segments, 1);
}
/* ----------- END ------------ */
if (count($segments) > 0)
{
if ( ! file_exists(APPPATH.'controllers/'.$this->fetch_directory().$segments[0].EXT))
{
show_404($this->fetch_directory().$segments[0]);
}
}
else
{
$this->set_class($this->default_controller);
$this->set_method('index');
if ( ! file_exists(APPPATH.'controllers/'.$this->fetch_directory().$this->default_controller.EXT))
{
$this->directory = '';
return array();
}
}
return $segments;
}
show_404($segments[0]);
}
}
?>