php – 基于Woocommerce购物车项目计数的条件累进百分比折扣

Update – October 2018 (code improved)

是的,它可以使用一个技巧,来实现这一目标.通常我们在WooCommerce优惠券中使用的购物车折扣.这里的优惠券没有被挪用.我将在这里使用负面的按条件费,这将成为折扣.

计算：
– 项目计数基于项目数量和购物车中的项目总数
– 百分比为0.05(5％),随着每个额外项目的增长(如您所知)
– 我们使用折扣小计(以避免添加优惠券的多次折叠折扣)

代码：

add_action( 'woocommerce_cart_calculate_fees','cart_progressive_discount',50,1 );
function cart_progressive_discount( $cart ) {
    if ( is_admin() && ! defined( 'DOING_AJAX' ) )
        return;

    // For 1 item (quantity 1) we EXIT;
    if( $cart->get_cart_contents_count() == 1 )
        return;

    ## ------ Settings below ------- ##

    $percent = 5; // Percent rate: Progressive discount by steps of 5%
    $max_percentage = 50; // 50% (so for 10 items as 5 x 10 = 50)
    $discount_text = __( 'Quantity discount','woocommerce' ); // Discount Text

    ## ----- ----- ----- ----- ----- ##

    $cart_items_count = $cart->get_cart_contents_count();
    $cart_lines_total = $cart->get_subtotal() - $cart->get_discount_total();

    // Dynamic percentage calculation
    $percentage = $percent * ($cart_items_count - 1);

    // Progressive discount from 5% to 45% (Between 2 and 10 items)
    if( $percentage < $max_percentage ) {
        $discount_text .=  ' (' . $percentage . '%)';
        $discount = $cart_lines_total * $percentage / 100;
        $cart->add_fee( $discount_text,-$discount );
    }
    // Fixed discount at 50% (11 items and more)
    else {
        $discount_text .=  ' (' . $max_percentage . '%)';
        $discount = $cart_lines_total * $max_percentage / 100;
        $cart->add_fee( $discount_text,-$discount );
    }
}

代码放在活动子主题的function.php文件中.经过测试和工作.

When using FEE API for discounts (a negative fee),taxes are always applied.

参考文献：

> WooCommerce – Adding shipping fee for free user plan
> WooCommerce – Make a set of coupons adding a fixed fee to an order
> WooCommerce class – WC_Cart – add_fee() method