Add-cart.php Num Site

To build a reliable cart, our PHP script needs to answer three questions every time a user clicks "Add to Cart": Is there already a cart session? If not, we need to create one. Is this product already in the cart? If yes, we need to the new quantity to the existing quantity. Is this a brand new product? If yes, we add it as a new line item. Step-by-Step Implementation: add-cart.php Create a file named add-cart.php

Edge cases and UX considerations

After processing, the script usually redirects the user back to the product page or to a summary page to confirm the action. showing how to implement this specific logic, or are you looking for troubleshooting tips for an existing script? add-cart.php num

Testing