我有一種產品很便宜。當且僅當購物車小計為 200 件或更多時，我想贈送該產品。如果購物車小計為 200 件或更多，請將產品添加到購物車并將價格設置為 0。如果購物車小計少于 200，請從購物車中刪除該產品。在添加和刪除時，我使用通知來通知客戶。除了產品價格發生變化外，一切都按計劃進行。如果有人可以檢查我正在使用的代碼并修復這一問題，我將非常感激。add_action( 'woocommerce_before_calculate_totals', 'free_product_if_cart_minimum', 10, 1 );function free_product_if_cart_minimum( $cart ) {    // go away if admin    if (is_admin() && !defined( 'DOING_AJAX' )) return;    // say no to hook repetition     if (did_action( 'woocommerce_before_calculate_totals' ) >= 2 ) return;    $minimum_amount = 200;    $free_product_id = 4576;    $cart_items_total = 0;    // cart loop    foreach ( $cart->get_cart() as $cart_item_key => $cart_item ){            // is the free product there?        if ( $cart_item['data']->get_id() == $free_product_id ) {                    $free_item_key = $cart_item_key;        // set the price to zero        // I've tried them both without success                // $free_item_key->set_price( 0 );        // $free_product_id->set_price( $price * 0.00 );    }        // cart subtotal incl. tax and discounts    $cart_items_total += $cart_item['line_total'] + $cart_item['line_tax'];        }    // add the free product if not already there    if ( $cart_items_total >= $minimum_amount && !isset( $free_item_key ) ) {        $cart->add_to_cart( $free_product_id );        wc_add_notice( 'Thank you! Here\'s your free product.', 'notice' );    }    // if below the minimum, remove the free product    elseif ( $cart_items_total < $minimum_amount && isset( $free_item_key ) ) {        $cart->remove_cart_item( $free_item_key );        // display notice after removal        wc_add_notice( 'Your cart subtotal is less than 200 and therefore, the free product was removed.', 'notice' );    }}