在 Woocommerce 3 中更改自定义订单状态的电子邮件主题

我已成功更改 Woocommerce 处理订单的电子邮件主题(using 这个线程 https://stackoverflow.com/a/48880997/3730754):

add_filter( 'woocommerce_email_subject_customer_processing_order', 'email_subject_procs_order', 10, 2 );
function email_subject_procs_order( $formated_subject, $order ){
    return sprintf( esc_html__( 'Example of subject #%s', 'textdomain'), $order->get_id() );
} 

但我想在订单状态更改后再次发送带有新主题的处理订单电子邮件，所以我遵循这个踏板 https://stackoverflow.com/questions/48616541/add-custom-order-status-and-send-email-on-status-change-in-woocommerce调整主题等

add_action('woocommerce_order_status_order-accepted', 'backorder_status_custom_notification', 20, 2);
function backorder_status_custom_notification( $order_id, $order ) {
    // HERE below your settings
    $heading   = __('Your Awaiting delivery order','woocommerce');
    $subject = sprintf( esc_html__( 'New subject #%s', 'textdomain'), $order->get_id() );

    // Getting all WC_emails objects
    $mailer = WC()->mailer()->get_emails();

    // Customizing Heading and subject In the WC_email processing Order object
    $mailer['WC_Email_Customer_Processing_Order']->heading = $heading;
    $mailer['WC_Email_Customer_Processing_Order']->settings['heading'] = $heading;
    $mailer['WC_Email_Customer_Processing_Order']->subject = $subject;
    $mailer['WC_Email_Customer_Processing_Order']->settings['subject'] = $subject;

    // Sending the customized email
    $mailer['WC_Email_Customer_Processing_Order']->trigger( $order_id );
}

但仅接受第一封电子邮件主题更改。有办法让它一起工作吗？
Is if( $order->has_status( 'order-accepted' ))有权使用吗？

您需要在IF声明以避免该问题，这样：

add_filter( 'woocommerce_email_subject_customer_processing_order', 'email_subject_procs_order', 10, 2 );
function email_subject_procs_order( $formated_subject, $order ){
    // We exit for 'order-accepted' custom order status
    if( $order->has_status('order-accepted') ) 
        return  $formated_subject; 

    return sprintf( esc_html__( 'Example of subject #%s', 'textdomain'), $order->get_id() );
}

代码位于活动子主题（或活动主题）的 function.php 文件中。它应该有效。