$users = DB::table('users')->whereIn('id', array(1, 2, 3))->get()
DB::table('user')->whereIn('id', [100,200])->get();
$users = User::whereIn('id', [1,2,3,4])->get();
$users = DB::table('users')
->whereIn('id', [1, 2, 3])
->get();
$users = User::whereIn('id', array(1, 2, 3))->get();