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这可能有点令人困惑，但我会尽力解释。

我正在尝试创建一种功能，允许用户将用户添加到我们的网站。他们也可以查看和删除这些用户，但是为了数据安全，我不希望他们只能查看他们创建的用户在站点上的所有其他用户。

这是一家在线学习公司，我们正在尝试为“导师”提供添加和删除他们自己的“学生”的访问权限，同时看不到网站上的所有其他用户。我们还有其他角色需要保持不受影响，例如订阅者和管理员。

我创建了两个新角色。导师和学生。我遇到的问题是“导师”创建的用户未显示在用户列表中。它完全是空的，根本没有显示任何用户。

// Add a custom user role

$result = add_role( 'tutors', __(
'Tutors' ),
    array(
       'edit_users' => true,
       'create_users' => true,
       'delete_users' => true,
       'list_users' => true,
       'read' => true,
       'edit_posts' => true, 
       'edit_pages' => true, 
       'edit_others_posts' => true, 
       'create_posts' => true, 
       'manage_categories' => true, 
       'publish_posts' => true, 
       'edit_themes' => false, 
       'install_plugins' => false, 
       'update_plugin' => false, 
       'update_core' => false, 
)
                  );
                  
$result1 = add_role( 'student', __('Student'),  
    array(
        'edit_users' => false,
        'create_users' => false,
        'delete_users' => false,
        'read' => true,
        'edit_posts' => false,
        'edit_pages' => false,
        'edit_others_posts' => false,
        'create_posts' => false,
        'manage_categories' => false,
        'publish_posts' => false,
        'edit_themes' => false,
        'install_plugins' => false,
        'update_plugin' => false,
        'update_core' => false
    )
);

/**
 * Admin New Tutor Function
 * @var int $user_id
 * @return void
 */
function student_register( $user_id ) {
    if( ! is_admin() ) {
        return;
    }

    // Grab the current user
    $current_user = wp_get_current_user();

    // IF the current user ID isn't 0 and our current user is a 'tutors' role
    if( $current_user->ID && in_array( 'tutors', $current_user->roles ) ) {

        // Update the new user with a 'parent' usermeta value of the current 'tutors'
        update_user_meta( $user_id, '_user_parent', $current_user->ID );
    }
}
add_action( 'user_register', 'student_register' );

/**
 * Pre Get Users filter
 * @var WP_Query Object $query
 * @return void
 */
function theme_pgu( $query ) {
    if( ! is_admin() ) {
        return;
    }

    // Grab our current user
    $current_user = wp_get_current_user();

    // IF our user ID is not 0 and our current user has a role of 'tutors'
    if( $current_user->ID && in_array( 'tutors', $current_user->roles ) ) {

        // Set the query to only return student roles
        $query->set( 'role', 'student' );

        // Which has a usermeta key '_user_parent' set
        $query->set( 'meta_key', '_user_parent' );

        // and has a usermeta value of the current tutor user
        $query->set( 'meta_value', $current_user->ID );
    }
}
add_action( 'pre_get_users', 'theme_pgu' );

/**
 * Selectable roles on the new user and user edit screen
 * @var Multi-dimensional Array $roles
 * @return Array $roles
 */
function client_sel_roles( $roles ) {
    // Grab our current user
    $current_user = wp_get_current_user();

    if( in_array( 'tutors', $current_user->roles ) ) {
        $roles = array( 'student' => $roles['student'] );
    }

    return $roles;
}
add_filter( 'editable_roles', 'client_sel_roles' );

/**
 * All Users screen filterable views
 * @var Array $views
 * @return Array $views
 */
function client_user_views( $views ) {
    // Grab our current user
    $current_user = wp_get_current_user();

    if( in_array( 'tutors', $current_user->roles ) ) {
        if( isset( $views['student'] ) ) {
            $views = array( 'student' => $views['student'] );
        } else {
            $views = array();
        }
    }

    return $views;
}
add_filter( 'views_users', 'client_user_views' );

/**
 * Stop clients from changing the URL to get to other profiles
 * @var WP_Screen Object $screen
 * @return void
 */
function edit_students_only( $screen ) {

    // Check if we're on the correct screen
    if( 'user-edit' === $screen->base ) {

        // Ensure our desired user ID is set
        if( isset( $_GET['user_id'] ) && is_numeric( $_GET['user_id'] ) ) {
            $user_id        = absint( $_GET['user_id'] );
            $current_user   = wp_get_current_user();
            $parent         = get_user_meta( $user_id, '_user_parent', true );

            // Ensure that we're viewing a profile that is not our own
            if( $current_user->ID && in_array( 'tutors', $current_user->roles ) && $user_id !== $current_user->ID && $parent !== $current_user->ID ) {

                // We're viewing an incorrect profile - redirect to clients own profile
                wp_redirect( admin_url( "user-edit.php?user_id={$current_user->ID}" ) );
            }
        }
    }
}
add_action( 'current_screen', 'edit_students_only' );
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