how to take the url to became a variable

[eluser]sherpa[/eluser]

Code:

function choose_testi($id=0){
    
         /* No need to get segment as thefunction expects the
          * parameter and if not specified the param '0' will be assinged in id default
          */

        //$id = $this->uri->segment(3,0);  // removed
        $this->db->where('id_testimonial',$id);
        $query = $this->db->get('testimonial');
        if($query->num_rows() > 0){ // it should be '$query' not '$user_row' my mistake
            $data[] = $query->row();
        }
        $this->load->view('adm_testimonial',$data);
  
    }