How to add page title in url?

I'm learn Codeignite on someone else's source. How to add $title for url in this controller?
As: website/mainitems/$id/$title

Code:

class mainitems extends CI_Controller {
    
    public function __construct() {
        parent::__construct();
    }
    
    //single movie page
    public function index($param = null)
    {
        $this->load->helper("form");
        $this->load->helper('url');

        $uri_string = $this->uri->segment(2);
        $movie = explode("-", $uri_string);
        $movieID = $this->db->escape(abs(intval(end($movie))));
        
        //get movie data
        $itemsRs = $this->db->get_where("items", array("id" => $movieID));
        $movieData = $itemsRs->result();
        
        $title = $movieData[0]->title;
        
        //data - result
        $data['movie_info'] = $movieData;
        
        $this->load->view('items', $data);
    }