<?php

Class Cart
{
    public $cart = [];
    public $product = [];

    public function __construct(){

    }

    public function add($id, $quantity){
        $this->product['id'] = $id;
        $this->product['quantity'] = $quantity;

        $this->cart[] = $this->product;
    }

    public function update($id, $quantity){
        if(!empty($this->cart[$id]['quantity'])){
            $this->cart[$id]['quantity'] += $quantity;
        }
    }

    public function delete($id){
        unset($this->$cart[$id]);
    }

    public function empty(){
        unset($this->$cart);
    }
}