php - WooCommerce 中一件免费产品的数量折扣

Question

我想免费赠送三件产品。如果有人添加了更多数量的商品，我只想免费提供一个数量。这意味着从小计中扣除某一数量的价格。例如:一种产品的价格为 4，添加的总数量为 5。因此小计总计为 20。现在，我想从小计中扣除一个数量的价格。所以，扣除价格后，最终结果为小计15。

我已经尝试过这段代码。

$free_items_id = [344,345,346];
foreach ( $cart->get_cart() as $cart_item_key => $cart_item ) {
if ( in_array( $cart_item['product_id'], $free_items_id ) ) {
   if ( $cart_item['quantity'] > 1 ) {
    $price_to_be_deducted = $cart_item['data']->get_price();
    $updated_price = ( $cart_item['quantity'] - 1 ) * $price_to_be_deducted;
        $cart_item['data']->set_price( $updated_price );
    break;
    }
   else {
    $cart_item['data']->set_price( 0 );
   }
}
}

但是此代码将 $updated_price 与产品的总数量相乘。谁能给出任何解决方案。

Answer 1

要对一种产品的价格进行折扣(针对特定定义的产品)，当数量达到 2 件时，请尝试以下操作(您可以更改最低要求数量):

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

    if (did_action('woocommerce_before_calculate_totals') >= 2)
        return;

    $targeted_ids  = [344,345,346]; // Here define the valid products Ids
    $qty_threshold = 2; // Here define the minimum quantity required

    foreach ( $cart->get_cart() as $cart_item ) {
        if ( in_array( $cart_item['product_id'], $targeted_ids ) ) {
            $quantity = $cart_item['quantity'];
            if ( $quantity >= $qty_threshold ) {
                $discounted_price = $cart_item['data']->get_price() / $quantity * ($quantity - 1);
                $cart_item['data']->set_price( $discounted_price );
            }
        }
    }
}

或者(以同样的方式)，您可以添加全局计算的折扣小计，例如:

add_action( 'woocommerce_cart_calculate_fees', 'action_cart_calculate_fees', 30, 1 );
function action_cart_calculate_fees( $cart ) {
    if ( is_admin() && ! defined( 'DOING_AJAX' ) )
        return;

    $targeted_ids  = [344,345,346]; // Here define the valid products Ids
    $qty_threshold = 2; // Here define the minimum quantity required
    $discount      = 0; // Initializing

    foreach ( $cart->get_cart() as $cart_item ) {
        if ( in_array( $cart_item['product_id'], $targeted_ids ) ) {
            if ( $cart_item['quantity'] >= $qty_threshold ) {
                $discount += $cart_item['data']->get_price();
            }
        }
    } 
    
    if( $discount > 0 ) {
        $cart->add_fee( __( "Quantity discount", "woocommerce" ), -$discount);
    }
}

两种方法都应该有效。