在WooCommerce中应用特定优惠券代码时向客户发送电子邮件通知

add_action( 'woocommerce_applied_coupon', 'custom_email_on_applied_coupon', 10, 1 );
function custom_email_on_applied_coupon( $coupon_code ){
    if( $coupon_code == 'FREECLASS' ){
    
    
    // Get user billing email
    global $user_login;
    $user = get_user_by('login', $user_login );
    $email = $user->billing_email;
    
    
        $to = "$email"; // Recipient
        $subject = sprintf( __('Coupon "%s" has been applied'), $coupon_code );
        $content = sprintf( __('The coupon code "%s" has been applied'), $coupon_code );

        wp_mail( $to, $subject, $content );
    }
}

function action_woocommerce_applied_coupon( $coupon_code ) {
    // NOT logged in, return
    if ( ! is_user_logged_in() ) return;
    
    // Compare
    if ( $coupon_code == 'freeclass' ) {
        // Get user ID
        $user_id = get_current_user_id();
        
        // Get the WC_Customer instance Object
        $customer = New WC_Customer( $user_id );
        
        // Billing email
        $email = $customer->get_billing_email();
        
        // NOT empty
        if ( ! empty ( $email ) ) {
            // Recipient
            $to = $email;
            $subject = sprintf( __('Coupon "%s" has been applied', 'woocommerce' ), $coupon_code );
            $content = sprintf( __('The coupon code "%s" has been applied by a customer', 'woocommerce' ), $coupon_code );
            $headers = array( 'Content-Type: text/html; charset=UTF-8' );

            wp_mail( $to, $subject, $content, $headers );
        }
    }
}
add_action( 'woocommerce_applied_coupon', 'action_woocommerce_applied_coupon', 10, 1 );