把这个放在一个盒子里。php文件，将其作为插件上传，然后通过网络激活它。有关详细信息，请阅读代码中的注释。

如果您有任何疑问或它对您不起作用，请告诉我。我这样做是为了让超级管理员可以使用所有网站，无论发生什么。

<?php

/*
Plugin Name: No Role No Login
Description: If the user in a multisite has no role for a site, he will not be able to access it while logged in. Does not affect super administrators.
Author: Nikolay Nikolov
Version: 1.0.0
*/

add_action( \'init\', \'no_role_no_login\' );

function no_role_no_login() {

    // If the user is logged-in and not a super administrator we continue
    if ( is_user_logged_in() && ! current_user_can( \'manage_network\' ) ) {

        // If this is a logout attempt, we do nothing, so we allow it
        if ( ( ( isset( $GLOBALS[\'pagenow\'] ) && \'wp-login.php\' === $GLOBALS[\'pagenow\'] )
            || ( isset( $_SERVER[\'PHP_SELF\'] ) && \'/wp-login.php\' === $_SERVER[\'PHP_SELF\'] ) )
            && isset( $_GET[\'action\'] ) && \'logout\' === $_GET[\'action\'] ) {

        // If this is not a logout attempt, we will check if the user has a role for the site and deny access if he does not (and show a message)
        } else {

            $get_users = get_users(
                array(
                    \'blog_id\' => get_current_blog_id(),
                    \'include\' => array( get_current_user_id() )
                )
            );

            if ( empty( $get_users ) ) {
                wp_die( \'You cannot access this site while logged in. To view it, you have to <a href="\' . wp_logout_url() . \'">logout</a>.\' );
            }

        }
    }

}