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<div class="codetitle"><a style="CURSOR: pointer" data="55340" class="copybut" id="copybut55340" onclick="doCopy('code55340')"> 代码如下:<div class="codebody" id="code55340">
<?php
/*
by lenush;
/
class Tree
{
var $data = array();
var $child = array(-1=>array());
var $layer = array(-1=>-1);
var $parent = array(); function Tree ($value)
{
$this->setNode(0,-1,$value);
} // end func function setNode ($id,$parent,$value)
{
$parent = $parent?$parent:0; $this->data[$id] = $value;
$this->child[$id] = array();
$this->child[$parent][] = $id;
$this->parent[$id] = $parent; if (!isset($this->layer[$parent]))
{
$this->layer[$id] = 0;
}
else
{
$this->layer[$id] = $this->layer[$parent] + 1;
}
} // end func function getList (&$tree,$root= 0)
{
foreach ($this->child[$root] as $key=>$id)
{
$tree[] = $id; if ($this->child[$id]) $this->getList($tree,$id);
}
} // end func
function getValue ($id)
{
return $this->data[$id];
} // end func
function getLayer ($id,$space = false)
{
return $space?str_repeat($space,$this->layer[$id]):$this->layer[$id];
} // end func function getParent ($id)
{
return $this->parent[$id];
} // end func function getParents ($id)
{
while ($this->parent[$id] != -1)
{
$id = $parent[$this->layer[$id]] = $this->parent[$id];
} ksort($parent);
reset($parent); return $parent;
} // end func function getChild ($id)
{
return $this->child[$id];
} // end func function getChilds ($id = 0)
{
$child = array($id);
$this->getList($child,$id); return $child;
} // end func
} // end class
//new Tree(根目录的名字);
//根目录的ID自动分配为0
$Tree = new Tree('目录导航'); //setNode(目录ID,上级ID，目录名字);
$Tree->setNode(1,'目录1');
$Tree->setNode(2,1,'目录2');
$Tree->setNode(3,'目录3');
$Tree->setNode(4,3,'目录3.1');
$Tree->setNode(5,'目录3.2');
$Tree->setNode(6,'目录3.3');
$Tree->setNode(7,2,'目录2.1');
$Tree->setNode(8,'目录2.2');
$Tree->setNode(9,'目录2.3');
$Tree->setNode(10,6,'目录3.3.1');
$Tree->setNode(11,'目录3.3.2');
$Tree->setNode(12,'目录3.3.3'); //getChilds(指定目录ID);
//取得指定目录下级目录.如果没有指定目录就由根目录开始
$category = $Tree->getChilds(); //遍历输出
foreach ($category as $key=>$id)
{
echo $Tree->getLayer($id,'|-').$Tree->getValue($id)."
n";
}
?>
（编辑：李大同）
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