基於產品總數的某種類別的折扣

Question

在WooCommerce中，我有一類稱爲樣品的產品，每個樣品的成本爲2.99美元。 但是，我想要一種方法，當5個樣品添加到購物車時，將樣品的成本自動從$ 2.99更改爲$ 1。

因此，如果將4個樣品添加到購物車，總數將是11.96美元......但如果添加5個，總數將是5美元。

因此，對於每5種產品，產品價格將改變從$ 2.99 $ 1，但如果6個樣品添加到購物車總數爲$ 7.98和是否添加10的總數是10等$ ...

我怎麼能做到這一點？

謝謝。

Answer 1

- 更新 -

這裏是什麼，應該是方便您的要求。
此功能將增加折扣購物車：

add_action('woocommerce_cart_calculate_fees','custom_cart_discount', 10, 1); 
function custom_cart_discount($cart_object) { 

    if (is_admin() && ! defined('DOING_AJAX')) 
     return; 

    // Define HERE your targeted product category (id, slug or name are accepted) 
    $category = 'posters'; 
    // Set the price for Five HERE 
    $price_x5 = 5; 

    // initializing variables 
    $calculated_qty = 0; 
    $calculated_total = 0; 
    $discount = 0; 

    // Iterating through each cart item 
    foreach($cart_object->get_cart() as $item_key => $item): 

     // Make this discount calculations only for products of your targeted category 
     if(has_term($category, 'product_cat', $item['product_id'])): 

      $item_price = $item["data"]->price; // The price for one (assuming that there is always 2.99) 
      $item_qty = $item["quantity"];// Quantity 
      $item_line_total = $item["line_total"]; // Item total price (price x quantity) 
      $calculated_qty += $item_qty; // ctotal number of items in cart 
      $calculated_total += $item_line_total; // calculated total items amount 
     endif; 
    endforeach; 

    // ## CALCULATIONS (updated) ## 
    if($calculated_qty >= 5):  
     for($j = 5, $k=0; $j <= $calculated_qty; $j+=5,$k++); // Update $k=0 (instead of $k=1) 
     $qty_modulo = $calculated_qty % 5; 
     $calculation = ($k * $price_x5) + ($qty_modulo * $item_price); 
     $discount -= $calculated_total - $calculation; 
    endif; 

    // Adding the discount 
    if ($discount != 0) 
     $cart_object->add_fee(__('Quantity discount', 'woocommerce'), $discount, false); 
     // Note: Last argument in add_fee() method is related to applying the tax or not to the discount (true or false) 
}