Code-Snippets-Functions/Execute a function on a child site/WooCommerce/display-product-sale-price-checkout.txt

add_filter( 'woocommerce_cart_item_subtotal', 'show_sale_price_at_checkout', 10, 3 );
function show_sale_price_at_checkout( $subtotal, $cart_item, $cart_item_key ) {
    
    // gets the product object
    $product = $cart_item['data'];
    // get the quantity of the product in the cart
    $quantity = $cart_item['quantity'];

    // check if the object exists
    if ( ! $product ) {
        return $subtotal;
    }

    // check if the product is on sale
    if ( $product->is_on_sale() && ! empty( $product->get_sale_price() ) ) {
        // shows sale price and regular price       
        $price = wc_format_sale_price (
            // regular price
            wc_get_price_to_display(
                $product, array(
                    'price' => $product->get_regular_price(),
                    'qty' => $quantity
                    )
                ),
            // sale price
            wc_get_price_to_display( $product, array (
                'price' => $product->get_sale_price(),
                'qty' => $quantity
                )
            )
        ) . $product->get_price_suffix();
    } else {
        // shows regular price
        $price = wc_price (
            // regular price
            wc_get_price_to_display(
                $product, array (
                    'price' => $product->get_regular_price(),
                    'qty' => $quantity
                )
            )
        ) . $product->get_price_suffix();
    }
   
    return $price;
}