Bolt\Users::removeRole PHP Method

    public function removeRole($id, $role)
    {
        $user = $this->getUser($id);
        if (empty($user) || empty($role)) {
            return false;
        }
        // Remove the role from the $user['roles'] array.
        $user['roles'] = array_diff($user['roles'], [(string) $role]);
        return $this->saveUser($user);
    }