PHP develops a simple shopping cart to implement purchase function

buy.php This page completes the purchase function

The main purpose here is to process the purchase of goods in the session, and combine the product information in the session with the purchased product information Compared.

If it is the first time to purchase an item, add the product information to the shopping cart and calculate the total price.

If you click to purchase again, the quantity of purchased items will be increased by 1, and the total price will be calculated. To recalculate, view the shopping cart link to the shopping cart page.