title: Codeigniter multilanguage route
body: <p>Hi all is there anyone can help me routing my app urls according to $_SESSION param?</p>
  
  <p>which is the best way to switch lang routes?</p>
  
  <p>what about use many route files? (i mean route_ch.php,route_en.php,route_sp.php,)</p>
  
  <p>is there any link to understand how to route according to site lang?</p>
  
  <p>thanks guys</p>