How to Change Dash based URLs To Underscore  in Codeigniter
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Step 1   Add a new class in your 'application/core' directory .

<?php (defined('BASEPATH')) OR exit('No direct script access allowed');
 
class URLCHANGE_Router extends CI_Router 
{
    function _set_request ($param= array())
    {
        parent::_set_request(str_replace('-', '_', $param));
    }
}                      
                

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