php 无限分类实验

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<?php 
class Tree
{
public $data=array();
public $cateArray=array();
function setNode($id,$parent,$value)
{
$parent=$parent?$parent:0;
$this->data[$id]=$value;
$this->cateArray[$id]=$parent;
}
function getChilds($id=0)
{
$childArray=array();
$childs=$this->getChild($id);
foreach($childs as $child)
{
$childArray[]=$child;
$childArray=array_merge($childArray,$this->getChilds($child));
}
return $childArray;
}
function getChild($id)
{
$childs=array();
foreach ($this->cateArray as $child=>$parent)
{
if($parent==$id)
{
$childs[$child]=$child;
}
}
return $childs;
}
//单线获取父节点
function getNodeLever($id)
{
$parents=array();
if(array_key_exists($this->cateArray[$id],$this->cateArray))
{
$parents[]=$this->cateArray[$id];
$parents=array_merge($parents,$this->getNodeLever($this->cateArray[$id]));
}
return $parents;
}

function getLayer($id,$preStr='-')
{
return str_repeat($preStr,count($this->getNodeLever($id)));
}
function getValue($id)
{
return $this->data[$id];
}//end func
}
?>