如何将购物车日期插入数据库？

I'm doing an online Food Ordering System and it has the add to cart function. Below is my cart function code. I would like to insert the data added into the cart by customer into the database to be viewed by the admin or staff to prepare the order. I have no idea how to make it work. I am very new to PHP and this is my first project. Please kindly help me.. I'm doing an online Food Ordering System and it