WP_REST_Users_Controller::update_item_permissions_check PHP Method

    public function update_item_permissions_check($request)
    {
        $id = (int) $request['id'];
        if (!current_user_can('edit_user', $id)) {
            return new WP_Error('rest_cannot_edit', __('Sorry, you are not allowed to edit this user.'), array('status' => rest_authorization_required_code()));
        }
        if (!empty($request['roles']) && !current_user_can('edit_users')) {
            return new WP_Error('rest_cannot_edit_roles', __('Sorry, you are not allowed to edit roles of this user.'), array('status' => rest_authorization_required_code()));
        }
        return true;
    }