如果您没有确认电子邮件，但必须挂接激活才能使用add_user_to_blog. 如果您提供两个元数据字段，WordPress将在用户激活时向现有博客（现在称为网站）添加用户：

<?php
$user_blog_id = 2; // or get_current_blog_id(), etc.
$user_meta = [
    \'add_to_blog\' => $user_blog_id,
    \'new_role\' => \'subscriber\' // or any other role your site has...
];
// WordPress has a built-in action on activation to look
//     for the above fields and assign the user to a
//     given blog id (network site) and role.
\\wpmu_signup_user( $user_name, $user_email, apply_filters( \'add_signup_meta\', $user_meta ) );