Laravel Session::forget Method alters my JSON Get Request Output

I'm currently storing and retrieving data through angular requests that puts and retrieves values from a Laravel Session Array.

// Code for pushing into Laravel Session Array
Session::push('cart', $object); 

// Code for retrieving data into Laravel Session Array
return Session::get('cart'); 

Now i'm using a foreach loop to update quantity or where this question is about: To remove an object from the Laravel Session Array Cart when quantity is 0.

foreach ($cart as $index => &$product) {
            if ($product['id'] == $id) {
                if($operator == '+'){
                    $product['quantity'] = $product['quantity'] + $quantity;
                } else if($operator == '-'){
                    $product['quantity'] = $product['quantity'] - $quantity;
                    if($product['quantity'] == 0){ 
                        Session::forget('cart.' . $index);
                        $cart = Session::get('cart', []);
                        Session::push('cart', $cart);
                    }
                }
                Session::set('cart', $cart);
                $this->new_product = false;
                break;
            }
        }

This part of the code above is altering my JSON output:

Session::forget('cart.' . $index);
$cart = Session::get('cart', []);
Session::push('cart', $cart);

JSON Situation Before Deleting:

[
  {
   "id":293,
   "quantity":2
  },
  {
   "id":294,
   "quantity":2
  }
]

JSON Situation After Deleting:

{"1":{"id":293,
      "quantity":2}
}

But Should Be:

 [
  {
   "id":293,
   "quantity":2
  }
]

This is my JSON Get Request which simply calls: return Session::get('cart')

Cart.getCart()
   .then(function (success){
       $scope.cart = success.data;
    }).catch(function (e){
       console.log("got an error in the process", e);
    });

Any help would be appreciated. Not sure what is causing my json array to transform into a different data model.

via Chebli Mohamed