Horde_Perms_Permission::unsetPerm PHP Method

    public function unsetPerm($permId, $permission, $update = true)
    {
        if (is_array($permId)) {
            if (empty($permId['name'])) {
                return;
            }
            if ($this->get('type') == 'matrix') {
                if (isset($this->data[$permId['class']][$permId['name']])) {
                    $this->data[$permId['class']][$permId['name']] &= ~$permission;
                    if (empty($this->data[$permId['class']][$permId['name']])) {
                        unset($this->data[$permId['class']][$permId['name']]);
                    }
                } else {
                    $update = false;
                }
            } else {
                unset($this->data[$permId['class']][$permId['name']]);
            }
        } else {
            if ($this->get('type') == 'matrix') {
                if (isset($this->data[$permId])) {
                    $this->data[$permId] &= ~$permission;
                } else {
                    $update = false;
                }
            } else {
                unset($this->data[$permId]);
            }
        }
        if ($update) {
            $this->save();
        }
    }