以编程方式发送带有新订单电子邮件的.ics附件

Question

我想以.ics文件格式通过程序以新顺序的电子邮件形式发送一些附件，其中包含客户信息。我的邮件发送到各个电子邮件的顺序不同。用于下订单时，并在订单电子邮件后发送发送

function iconic_processing_notification( $order_id ) {

    $order = wc_get_order( $order_id ); 

    $firstname = "John";
    $lastname = "Smith";
    $email = "sitetesting747@gmail.com";
    $meeting_date = "2019/11/11 10:00:00"; //mysql format
    $meeting_name = "Hello";
    $meeting_duration = 7200;

    //returns true or false
    $result = sendIcalEmail($firstname,$lastname,$email,$meeting_date,$meeting_name,$meeting_duration);

    //display result
    IF($result) {
        ECHO "Email sent successfully.";
    } ELSE {
        ECHO "A problem occurred sending email";
    } 

}
} 
}
 add_action( 'woocommerce_order_status_pending_to_processing_notification', 'iconic_processing_notification', 10, 1 );