要更新现有用户，请尝试创建一个脚本文件并将该代码放在其中（您必须需要必要的文件wp-load.php 如果您将该文件放在wp实例的根目录中），或通过在钩子上列出init 挂钩：

$blogusers = get_users( \'role=subscriber\' ); //get users by role
// Array of WP_User objects.
foreach ( $blogusers as $user ) { //loop throught users
    update_user_meta($user->ID, \'user_login\', sanitize_title($user->first_name.\' \'.$user->last_name)); //update user login

    //if $user->first_name / $user->last_name didn\'t work, try to get the first and last names by using get_user_meta($user->ID, \'first_name\', true)...
}

PS：代码未测试。