For more complex environments like , this functionality is often abstracted into a single command: WC()->cart->add_to_cart($product_id, $quantity) .
add-cart.php?num=5 add-cart.php?num=PROD123:2 add-cart.php num
: It receives data from a frontend request—often via an AJAX POST or a standard HTML form—including the product_id , the desired quantity (or num ), and sometimes specific variations like size or color. For more complex environments like , this functionality