function setnode($id,$parent,$value,$num=0)
{
$parent = $parent ? $parent : 0;

$this->data[$id] = $value;
$this->num[$id] = $num;
if (!isset($this->child[$id])) $this->child[$id] = array();
$this->child[$parent][] = $id;
$this->parent[$id] = $parent;

if (!isset($this->layer[$parent]) && $parent == 0)
{
$this->layer[$id] = 0;
}
else
{
$this->layer[$id] = $this->layer[$parent] + 1;
}
}

function getlist(&$tree,$root= 0)
{
foreach ($this->child[$root] as $key=>$id)
{
$tree[] = $id;
if($this->child[$id]) $this->getlist($tree,$id);
}
}

function getvalue($id)
{
if($this->layer[$id]==0)
{
return $this->data[$id];
}
else
{
return $leftmar.$this->data[$id];
}
}

function getnum($id)
{
return $this->num[$id];
}

function getbitvalue($id)
{
return $this->data[$id];
}

function getlayer($id,$space = false)
{
return $space ? str_repeat($space,$this->layer[$id]) : $this->layer[$id];
}

function getparent($id)
{
return $this->parent[$id];
}

function getparents($id)
{
while ($this->parent[$id] != -1)
{
$id = $parent[$this->layer[$id]] = $this->parent[$id];
}

ksort($parent);
reset($parent);

return $parent;
}

function getchild($id)
{
return $this->child[$id];
}

function getchilds($id = 0)
{
$child = array($id);
$this->getlist($child,$id);

return $child;
}

function printdata()
{
return $this->layer;
}
}
?>