Cart item discount based on quantity in Woocommerce 3

Since woocommerce version 3+ the linked answer code doesn't work. It needs something different and can even be done in a better way.

The code will apply a cart item discount based on the cart item quantity. In this code example, it will apply a discount of 5% on the cart item, when the quatity is equal or more than 2 (two).

The cart item unit price displayed is always the real product price. The discount will be effective and displayed on the cart item subtotal.

Additionally the product name will be appended with a discount mention.

The code:

add_filter('woocommerce_add_cart_item_data', 'add_items_default_price_as_custom_data', 20, 3 );function add_items_default_price_as_custom_data( $cart_item_data, $product_id, $variation_id ){    $product_id = $variation_id > 0 ? $variation_id : $product_id;    ## ----- YOUR SETTING ----- ##    $discount_percentage = 5; // Discount (5%)    // The WC_Product Object    $product = wc_get_product($product_id);    // Only for non on sale products    if( ! $product->is_on_sale() ){        $price = (float) $product->get_price();        // Set the Product default base price as custom cart item data        $cart_item_data['base_price'] = $price;        // Set the Product discounted price as custom cart item data        $cart_item_data['new_price'] = $price * (100 - $discount_percentage) / 100;        // Set the percentage as custom cart item data        $cart_item_data['percentage'] = $discount_percentage;    }    return $cart_item_data;}// Display the product original priceadd_filter('woocommerce_cart_item_price', 'display_cart_items_default_price', 20, 3 );function display_cart_items_default_price( $product_price, $cart_item, $cart_item_key ){    if( isset($cart_item['base_price']) ) {        $product        = $cart_item['data'];        $product_price  = wc_price( wc_get_price_to_display( $product, array( 'price' => $cart_item['base_price'] ) ) );    }    return $product_price;}// Display the product name with the discount percentageadd_filter( 'woocommerce_cart_item_name', 'append_percetage_to_item_name', 20, 3 );function append_percetage_to_item_name( $product_name, $cart_item, $cart_item_key ){    if( isset($cart_item['percentage']) && isset($cart_item['base_price']) ) {        if( $cart_item['data']->get_price() != $cart_item['base_price'] )            $product_name .= ' <em>(' . $cart_item['percentage'] . '% discounted)</em>';    }    return $product_name;}add_action( 'woocommerce_before_calculate_totals', 'custom_discounted_cart_item_price', 20, 1 );function custom_discounted_cart_item_price( $cart ) {    if ( is_admin() && ! defined( 'DOING_AJAX' ) )        return;    if ( did_action( 'woocommerce_before_calculate_totals' ) >= 2 )        return;    ## ----- YOUR SETTING ----- ##    $targeted_qty = 2; // Targeted quantity    // Loop through cart items    foreach ( $cart->get_cart() as $cart_item ) {        // For item quantity of 2 or more        if( $cart_item['quantity'] >= $targeted_qty && isset($cart_item['new_price']) ){            // Set cart item discounted price            $cart_item['data']->set_price($cart_item['new_price']);        }    }}

Code goes in functions.php file of your active child theme (or active theme). Tested and works.

To display the discounted product price instead of the original product price, just remove woocommerce_cart_item_price() function (and hook)…

Newest similar: Cart item quantity progressive percentage discount in Woocommerce 3