php - how to show title as url instead of id in laravel 5.1? -

in controller

 public function show($id)  {   } 

in route

route::get('post/{id}','postcontroller@show'); 

how show title url instead of id ? , possible change url title otherwise need specify unique title in database table ?

in controller

public function show($title) // understanding  {   } 

in route

route::get('post/{title}','postcontroller@show'); 

in view use title instead of id.