add to collection laravel

1$item = collect();
2$item->push($product);

1$name = DB::table('users')->where('name', 'John')->pluck('name');

1$collection = collect([1, 2, 3, 4]);
2
3$collection->push(5);
4
5$collection->all();
6
7// [1, 2, 3, 4, 5]

1$collection = collect([1,2,3,4]);
2
3$collection->each(function($item){
4    return $item*$item;
5});
6
7// [1,4,9,16]

1If you want to add a product into the array you can use:
2
3$item['product'] = $product;