Save file in Laravel

Save file in Laravel

 $file = $req->file('picture');
  $old = public_path($user->getAttributes()['picture']);
  if(
      $old && 
      is_file($old)
  )
  {
      unlink($old);
  }
  $name = $user->id .'-picture.' . $file->getClientOriginalExtension();
  $folder = 'storage/user/avatar/' ;
  $file->move(public_path($folder), $name);
  $user->picture = $folder . $name;