How to Implement Discounts on Category Y Based on Product X Quantity Range in WooCommerce?

One easy tactic to encourage customers to buy and explore items of a particular category that you wish is by providing discounts to those category items. Here, in this WooCommerce customization, based on the quantity range of a specific product, the discounts are applied to the items belonging to a specific category. By implementing quantity-based discounts, you can drive more sales and effectively promote specific product categories.

Solution: Implement Discounts on Category Y Based on Product X Quantity Range in WooCommerce

The below code snippet implements the discounts on items of Category Y such as Kitchen accessories depending on the quantity of a main product like Handy chopper (Product X) added to the cart.

add_action('template_redirect', 'ts_add_product_to_cart');

function ts_add_product_to_cart() {
    if (!is_admin()) {
        global $woocommerce;

        $product_a_id = 948;
        $product_cat_id = 64;

        // Set the targeted quantity range for the parent product
        $min_targeted_qty = 5;
        $max_targeted_qty = 10;

        // Flag to check if the discount has been applied
        $discount_applied = false;

        // Loop through cart items
        foreach (WC()->cart->get_cart() as $cart_item_key => $cart_item) {
            // Check if the current product is the parent product
            if ($cart_item['product_id'] == $product_a_id) {
                // Check if the quantity of the parent product falls within the specified range
                if ($cart_item['quantity'] >= $min_targeted_qty && $cart_item['quantity'] <= $max_targeted_qty) {
                    // Loop through cart items and check if there are products from the specified category id
                    foreach (WC()->cart->get_cart() as $inner_cart_item_key => $inner_cart_item) {
                        // Check if the product is in the specified category
                        $product_cats_id_incart = wc_get_product_term_ids($inner_cart_item['data']->get_id(), 'product_cat');

                        if (!is_admin() && in_array($product_cat_id, $product_cats_id_incart)) {
                            // Apply a 20% discount for each item of category 'y' in the cart
                            $discount_percentage = 20;
                            $original_price = floatval($inner_cart_item['data']->get_price());
                            $discount_amount = $original_price * $discount_percentage / 100;
                            $new_price = $original_price - $discount_amount;

                            // Set the new discounted price
                            $inner_cart_item['data']->set_price($new_price);

                            // Set the flag to indicate that the discount has been applied
                            $discount_applied = true;
                        }
                    }
                }
            }
        }

        // If the discount is applied, you may need to update the cart totals
        if ($discount_applied) {
            WC()->cart->calculate_totals();
        }
    }
}

Output

When the targeted product X is added to the cart and the quantity of this product, when set in between 5 to 10, the code applies a 20% discount to all items of category Y present in the cart.

If the quantity of the specific targeted product X doesn’t fall within the specified range of 5 to 10, the code doesn’t imply any discounts for the items related to category Y.

Likewise, you can simply offer a WooCommerce BOGO deal based on the quantity range of a specific product. without being specific to the category of items.