Question on woocommerce, on crosssale, how to immediately add it to the cart?

Question

WooCommerce

How to add a function to the crosssale so that it is immediately added to the cart. Or when adding any product, it automatically added the product as in the second screen. - Klass-food.ru
- Butcher.rf

Answer 1

This is how the product is added to the cart.
WC()->cart->add_to_cart( $product_id );
How to check if a product is in the cart

$product_cart_id = WC()->cart->generate_cart_id( $product_id );
 $in_cart = WC()->cart->find_product_in_cart( $product_cart_id );

This hook is triggered when adding a product to the cart
'woocommerce_add_to_cart' It
remains only to collect it in a function ))