How to apply discount on variables and individual products in WooCommerce based on cart quantity and product attributes?

Question

I'm trying to apply a percentage discount based on the number of products in the cart with a specific product attribute.

More precisely, my goal is to apply a 15% discount when purchasing at least 6 products with attribute "flaske".

I've successfully achieved this on products with variable properties set, but I can't seem to do it for a single/simple product.

This is my code so far (borrowed from WooCommerce for quantity and price conditions)

// 根据购物车中的产品数量和属性进行折扣。
add_action( 'woocommerce_cart_calculate_fees','wc_cart_item_quantity_discount' );
function wc_cart_item_quantity_discount( $cart ) {
    if ( is_admin() && ! defined( 'DOING_AJAX' ) )
        return;

    // 初始化变量。
    $min_item_amount = 6; // 最小数量。
    $discount = $items_count = $percent = $items_subtotal = 0;
    $taxonomy   = 'pa_variant'; // 分类
    $term_slugs = array('flaske'); // 术语
    // 遍历购物车中的物品
    foreach( $cart->get_cart() as $cart_item_key => $cart_item ) {
      // 遍历变体
      foreach( $cart_item['variation'] as $attribute => $term_slug ) {
        // 只计算具有属性且数量超过6的物品。
        if( $cart_item['data']->get_price() >= $min_item_amount && $attribute === 'attribute_'.$taxonomy && in_array( $term_slug, $term_slugs ) ) {
            $items_count += $cart_item['quantity'];
            $items_subtotal += $cart_item['line_subtotal'];
        }
      }
    }
    // 条件百分比。
    if ($items_count >= 6 ) {
        $percent = 15;
    }
    // 折扣（应税）。
    if( $items_count > 0 ) {
        // 计算
        $discount -= ($items_subtotal / 100) * $percent;
        $cart->add_fee( __( "Mix & Match rabat - $percent%", "woocommerce" ), $discount, true);
    }
}

My current code works great for variable products (variations) but seems to work for single products It has no effect, even if I give the single product the same properties as the variable product.

I suspect this has something to do with the foreach loop, i.e. foreach( $cart_item['variation'] as $attribute => $term_slug ).

How can I make it work in general so that it also works for a single/simple product with the same attribute "flaske"?

Thank you very much for your help and suggestions.

Answer 1

Offer Woocommerce percentage discount for each item based on quantity

Exclude variants with 2 specific attribute terms in Woocommerce, coupons are not available

add_action( 'woocommerce_cart_calculate_fees','wc_cart_item_quantity_discount' );
function wc_cart_item_quantity_discount( $cart ) {
    if ( is_admin() && ! defined( 'DOING_AJAX' ) )
        return;

    // 初始化变量。
    $min_item_amount = 6; // 最小数量
    $discount = $items_count = $percent = $items_subtotal = 0;
    $taxonomy   = 'pa_variant'; // 分类
    $term_slugs = array('flaske'); 
    // 遍历购物车中的物品
    foreach( $cart->get_cart() as $cart_item_key => $cart_item ) {
        $product = $cart_item['data'];
        $price   = $product->get_price();

        // 产品变种
        if( $product->is_type('variation') ) {
            // 遍历变种属性
            foreach ($cart_item['variation'] as $attribute => $term_slug) {
                // 只计算具有属性且数量大于6的物品。
                if ($price >= $min_item_amount && $attribute === 'attribute_' . $taxonomy && in_array($term_slug, $term_slugs)) {
                    $items_count += $cart_item['quantity'];
                    $items_subtotal += $cart_item['line_subtotal'];
                }
            }
        } 
        // 简单产品
        elseif ( $product->is_type('simple') ) {
            $attributes = $product->get_attributes();

            if( ! empty($attributes) && array_key_exists($taxonomy, $attributes) ) {
                $terms = (array) $attributes[$taxonomy]->get_terms(); // array of WP_Term objects
                $slugs = array_map(function($term) { return $term->slug; }, $terms); // Extract only the term slugs

                if ($price >= $min_item_amount && count( array_intersect($slugs, $term_slugs) ) > 0 ) {
                    $items_count += $cart_item['quantity'];
                    $items_subtotal += $cart_item['line_subtotal'];
                }
            }
        }
    }
    // 条件百分比
    if ($items_count >= 6) {
        $percent = 15;
    }
    // 折扣（应税）。
    if ($items_count > 0) {
        // 计算
        $discount -= ($items_subtotal / 100) * $percent;
        $cart->add_fee(__("Mix & Match rabat - $percent%", "woocommerce"), $discount, true);
    }
}

This should work