我需要根据添加和删除的每个角色添加用户元。我试图通过挂接add\\u user\\u角色并循环更新用户角色列表来实现这一点，但旧的角色仍然会返回到角色数组中。

因此，如果我转到admin user并取消选中author和check editor，角色循环仍然包括author

function update_user_department( $user_id ) {
    $user_meta = get_userdata($user_id);
    $user_roles = $user_meta->roles; // returning role that was unchecked with new role checked. Should only return roles that were checked when role was updated
    $ranks = get_ranks_expanded();
    $newDepartments = array();
    foreach ($user_roles as $user_role) {
        $department = $ranks[$user_role]["department"];
        if (!in_array($department, $newDepartments)) {
            $newDepartments[] = $department;
        }   
    }
    update_user_meta($user_id, "departments", $newDepartments);
}
add_action( \'add_user_role\', \'update_user_department\', 10 );

那么，我如何在角色更改后执行此操作，并提供一个仅反映更改后剩余角色的列表？

add_action( \'remove_user_role\', \'update_user_department\', 10, 1 );