$array[]='something' analog in Laravel array session logic

I can create session array in Laravel only with defining key by hand using Session::put('items.key','1'), but I have a situation when I just need keys to be made automatically as I would use simple PHP function $items[]=value. How can I do this in Laravel session?

P.S. I have tried Session::put('items[]','1'), but it doesn't worked.

via Chebli Mohamed