WooCommerce：显示购物车有优惠券折扣项目小计

add_filter( 'woocommerce_cart_item_subtotal', 'bbloomer_if_coupon_slash_item_subtotal', 99, 3 );
 
function bbloomer_if_coupon_slash_item_subtotal( $subtotal, $cart_item, $cart_item_key ){
global $woocommerce;
 
// Note: use your own coupon code here
$coupon_code = 'barmada'; 
 
if ( $woocommerce->cart->has_discount( $coupon_code )) {
 
// Note: apply your own coupon discount multiplier here
// In this case, it's a 99% discount, hence I multiply by 0.01
$newsubtotal = wc_price( $cart_item['data']->get_price() * 0.01 * $cart_item['quantity'] ); 
 
$subtotal = sprintf( '<s>%s</s> %s', $subtotal, $newsubtotal ); 
}
 
return $subtotal;
}