WooCommerce 教程：购买1件商品将免费产品添加到购物车

您可以在我自己的网站上看到这个。当您将产品添加到特定 SKU 的购物车中时，例如 “成为支持者” 产品时，另一个产品将自动添加到购物车中，并且还可以享受 100％的优惠券折扣。

要查看此操作，请访问 https://businessbloomer.com/bloomer-armada/#le_body_row_9 并添加到购物车 “支持者” 或 “合作伙伴” 包。当然这里还有 PHP 代码片段

PHP 代码片段：如果 SKU 被添加到 WooCommerce 购物车，则将 “产品礼物” 添加到购物车中

/**
 * @snippet       Buy 1, Get Free Product as a Gift - WooCommerce

 * @sourcecode    https://businessbloomer.com/?p=21732
 * @author        Rodolfo Melogli
 * @compatible    WC 2.6.14, WP 4.7.2, PHP 5.5.9
 */

function bbloomer_add_gift_if_sku_added_cart( $passed, $product_id, $quantity ) {
global $woocommerce;

/* enter array of SKUs that give gift */
$skuswithgift = array('armpar','armsup');

/* enter SKU of product gift */
$giftsku = 'starter';

/* enter name of coupon that gives 100% discount for specific product gift */
$coupon_code = 'xxxyyyzzz'; 

$product = wc_get_product( $product_id );

if ( $product->get_sku() && in_array( $product->get_sku(), $skuswithgift ) ) {
	WC()->cart->add_to_cart( wc_get_product_id_by_sku($giftsku) );
	wc_add_notice( __( 'Hey, Supporter! As promised, I added #CustomizeWoo Video Lessons for Free - you will be able to access them in a single place (~ My Courses ~) and get premium support.', 'woocommerce' ), 'success' );
	$woocommerce->cart->add_discount( $coupon_code );
}
return $passed;
}

add_filter( 'woocommerce_add_to_cart_validation', 'bbloomer_add_gift_if_sku_added_cart', 10, 3 );