在woocommerce中买一送一，无需优惠券代码

Question

我想在用户购买 x 产品时在我的网站上实现功能，然后用户将免费获得 y 产品。

在我的网站上，我有多种产品。如果客户购买 1 公斤包装的 X 产品，那么客户想要免费获得 30 毫升的 Y 产品。

我在我的 function.php 中添加了以下代码，但它的工作问题是当刷新页面礼品产品数量增加时。 我更新的代码。

    add_action( 'woocommerce_before_cart', 'bbloomer_apply_matched_coupons' );

function bbloomer_apply_matched_coupons() {

    global $woocommerce;
 $cat_in_cart = false;
    foreach ( $woocommerce->cart->cart_contents as $key => $values ) {

    // this is your product ID
    $autocoupon = array( 123411 );

    if( in_array( $values['variation_id'], $autocoupon ) ) {  
       $cat_in_cart = true;
        break;

    }


    }
 if ( $cat_in_cart ) {   
$product_id   = 2044;
$quantity     = 1;
$variation_id = 2046;
$variation    = array(
    'pa_size'  => '30ml'
);

$woocommerce->cart->add_to_cart( $product_id, $quantity, $variation_id, $variation );
 }

}

Answer 1

将此添加到“functions.php”的开头。

ob_start();
session_start();

然后添加此代码。

add_action( 'woocommerce_before_cart', 'bbloomer_apply_matched_coupons' );

function bbloomer_apply_matched_coupons() {

    if(!$_SESSION['GiftAdded']) {
        global $woocommerce;
        $cat_in_cart = false;
        $coupon_in_cart = false;

        $autocoupon = array( 123411 ); // variation ids of products that offers gifts
        $freecoupon = array( 2046 ); // variation ids of products that are gift coupons

        foreach ( $woocommerce->cart->cart_contents as $key => $values ) {      
            if( in_array( $values['variation_id'], $autocoupon ) ) {  
                $cat_in_cart = true;                
            }
            if( in_array( $values['variation_id'], $freecoupon) ) {  
                $coupon_in_cart = true;             
            }
        }

         if ( $cat_in_cart && !$coupon_in_cart ) {   
            $product_id   = 2044;
            $quantity     = 1;
            $variation_id = 2046;
            $variation    = array( 'pa_size'  => '30ml' );

            $woocommerce->cart->add_to_cart( $product_id, $quantity, $variation_id, $variation );
            $_SESSION['GiftAdded']=true;
        }
    }
}

$_SESSION['GiftAdded'] 将阻止手动删除的礼品产品再次添加。

Answer 2

还有另一种基于数量的替代方案，使用另一个钩子......当数量发生变化或产品从购物车中移除时，它会处理并将免费产品的价格设置为零：

add_action( 'woocommerce_before_calculate_totals', 'add_free_product_to_cart', 20, 1 );
function add_free_product_to_cart( $cart ) {
    if ( is_admin() && ! defined( 'DOING_AJAX' ) )
        return;

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

    $products_ids = array( 123411 ); // Products IDs to check
    $free_var_id  = 2046; // free product (variation ID)
    $free_prod_id = 2044; // free product (product ID)
    $free_attr    = array( 'pa_size'  => 'medium' ); // Free product attribute
    $free_price   = 0;

    $targeted = $free = array('qty' => 0 ); // Initializing

    // Loop through cart items
    foreach ( $cart->get_cart() as $cart_item_key => $cart_item ) {
        if ( in_array( $cart_item['data']->get_id(), $products_ids ) ) {
            $targeted['qty'] += $cart_item['quantity'];
        } elseif ( $cart_item['data']->get_id() == $free_var_id ) {
            $cart_item['data']->set_price($free_price);
            $free['qty'] += $cart_item['quantity'];
            $free['key'] = $cart_item_key;
        }
    }
    // We exit (No changes are needed)
    if( $targeted['qty'] == $free['qty'] )
        return;

    if( $targeted['qty'] > 0 && $free['qty'] == 0 )
    {
        // Add the free product
        $cart->add_to_cart( $free_prod_id, $targeted['qty'], $free_var_id, $free_attr );
    }
    elseif(  $targeted['qty'] > 0 && $free['qty'] > 0 && $targeted['qty'] != $free['qty'] )
    {
        // Adjust free product quantity
        $cart->set_quantity( $free['key'], $targeted['qty'] );
    }
    elseif(  $targeted['qty'] == 0 && $free['qty'] > 0)
    {
        // Remove free product
        $cart->remove_cart_item( $free['key'] );
    }
}

代码进入您的活动子主题（或主题）的 function.php 文件或任何插件文件中。