/**
 * Allow access to own content only
 */
function my_authored_content($query) {

//get current user info to see if they are allowed to access ANY posts and pages
$current_user = wp_get_current_user();
// set current user to $is_user
$is_user = $current_user->user_login;

//if is admin or \'is_user\' does not equal #username
if (!current_user_can(\'manage_options\')){
    //if in the admin panel
    if($query->is_admin) {

        global $user_ID;
        $query->set(\'author\',  $user_ID);

    }
    return $query;
}
return $query;
}
add_filter(\'pre_get_posts\', \'my_authored_content\');

您可以将其添加到main functions文件或将其转换为插件。