woocommerce自定义多个电子邮件收件人 - Wordpress

Question

我一直在寻找解决方案，因为我的woocommerce问题。我有能力让客户添加他自己的电子邮件和他朋友的电子邮件。但问题是，woocommerce只会向自己的电子邮件发送电子邮件。我已经使用一个名为：Woo Checkout Field Editor Pro的插件添加了朋友输入的电子邮件字段

我的问题是：如何添加此自定义输入以包含在订单完成后发送的电子邮件中。

我发现以下代码可能有用，但我不擅长用PHP编程，所以我不熟悉如何解决这个问题。

// Checks subscription for additional emails
add_filter( 'woocommerce_email_recipient_customer_completed_renewal_order', 'woocommerce_email_customer_invoice_add_recipients', 10, 2 );
add_filter( 'woocommerce_email_recipient_customer_renewal_invoice', 'woocommerce_email_customer_invoice_add_recipients', 10, 2 );
function woocommerce_email_customer_invoice_add_recipients( $recipient, $order ) {

    // Finds subscription for the order
    $subscription = wcs_get_subscriptions_for_order( $order, array( 'order_type' => array( 'parent', 'renewal' ) ) );

    if ( $subscription and array_values($subscription)[0] ) {
        // Find first subscription ID
        $subscription_id = array_values($subscription)[0]->id;
        // Check ACF field for additional emails
        $additional_emails = get_field('additional_emails', $subscription_id);

        if ($additional_emails) {
            // Found additional emails so add them to the $recipients list
            $recipient .= ', ' . $additional_emails;
        }
    }
    return $recipient;
}

以下代码：

add_filter( 'woocommerce_email_recipient_customer_invoice', 'woocommerce_email_customer_invoice_add_recipients' );
function woocommerce_email_customer_invoice_add_recipients( $recipient, $order ) {
	if ( 'joe@acme.com' == $recipient ) {
		$recipient .= ', billing@acme.com';
	}
	return $recipient;
}