woocommerce_coupon_get_discount_amount的折扣金额不正确

Question

如果使用我的优惠券类型，我会尝试打折购物车中最便宜的商品：

add_filter('woocommerce_coupon_get_discount_amount', 'wc_cpn_disc', 10, 5);
function wc_cpn_disc($discount, $discounting_amount, $cart_item, $single, $coupon) {
    // IF TYPE MATCHES PERFORM CUSTOM CALCULATION
    if ($coupon->type == 'cheapest_free'){
      global $woocommerce;
      foreach ( $woocommerce->cart->get_cart() as $cart_item_key => $values ) {
          $_product = $values['data'];
          $product_price[] = get_option('woocommerce_tax_display_cart') == 'excl' ? $_product->get_price_excluding_tax() : $_product->get_price_including_tax(); /*Store all product price from cart items in Array */
      }
      $lowestprice = min($product_price);
      $discount = number_format((float)$lowestprice/10,2,'.','');
    }

    return $discount;
}

折扣金额非常奇怪--无论我怎么尝试，它都不会达到我期望的值。起初我认为这是一个百分比折扣，但我希望这是一个固定的数额。我试着在网站的其他地方运行我的get know函数，当最低值项是11.95时，它返回1.195 -所以我知道这部分是有效的。但是总共265.60个篮子的折扣是23.90%-我就是不明白！

我只想买购物车里最便宜的东西，然后打折。

Answer 1

在Bossman和其他几个线程的帮助下，我设法解决了这个问题。事实证明，我需要更改我的方法-下面是完整的代码。

add_filter('woocommerce_coupon_get_discount_amount', 'tfcc_cheapest_free', 10, 5);
function tfcc_cheapest_free($discount, $discounting_amount, $cart_item, $single, $coupon) {
    // IF TYPE MATCHES PERFORM CUSTOM CALCULATION
    if ($coupon->type == 'cheapest_free'){

      $items_prices = [];
          $items_count  = 0;

          // Loop through cart items
          foreach( WC()->cart->get_cart() as $key => $item ){
              // Get the cart item price (the product price)
              if ( wc_prices_include_tax() ) {
                  $price = wc_get_price_including_tax( $item['data'] );
              } else {
                  $price = wc_get_price_excluding_tax( $item['data'] );
              }

              if ( $price > 0 ){
                  $items_prices[$key] = $price;
                  $items_count       += $item['quantity'];
              }
          }

          // Only when there is more than one item in cart
          if ( $items_count > 1 ) {
              asort($items_prices);  // Sorting prices from lowest to highest

              $item_keys = array_keys($items_prices);
              $item_key  = reset($item_keys); // Get current cart item key

              // Targeting only the current cart item that has the lowest price
              if ( $cart_item['key'] == $item_key ) {
                  return reset($items_prices)/$cart_item['quantity']; // return the lowest item price as a discount
              }
          } else {
              return 0;
          }

    }

}

我希望这能帮助将来需要类似功能的其他人。