function getChildrenIds ($sort_id)

{

$db = $this->loadDB();

$ids = '';

$sql = "SELECT * FROM t_dept WHERE `parent_id` = '{$sort_id}'";

$query = $db->query($sql);

$result = $query->result_array();


if ($result)

{

foreach ($result as $key=>$val)

{

$ids .= ','.$val['id'];

$ids .= $this->getChildrenIds ($val['id']);

}

}


return $ids;


}