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Codeigniter user profile URL
class user extends CI_Controller {

    public function __construct(){
        parent::__construct();
    }

    public function index($username = null){
        //load index page
        $this->load->view('profile/index');
    }

}

//user profiles pretty url
$route['user/(:any)'] = "user/index/$1";

$route['controller'] = "controller";
$route['controller/(:any)'] = "controller/$1";
$route['(:any)'] = "user/$1";

public function _remap($username = null) {
    $this->load->view('profile/index');
}