PHP無限分類的類

這段時間在寫一個部門許可權系統，需要用到無限分類技術，找了很多關於分類的代碼.逐個收藏起來.
<?php
/**
* @author YangHuan
* @datetime
* @version 1.0.0
*/

/**
* Short description.
*
* Detail description
* @author
* @version 1.0
* @copyright
* @access public
*/
class Tree
{
/**
* Description
* @var
* @since 1.0
* @access private
*/
var $data = array();

/**
* Description
* @var
* @since 1.0
* @access private
*/
var $child = array(-1=>array());

/**
* Description
* @var
* @since 1.0
* @access private
*/
var $layer = array(-1=>-1);

/**
* Description
* @var
* @since 1.0
* @access private
*/
var $parent = array();

/**
* Short description.
*
* Detail description
* @param none
* @global none
* @since 1.0
* @access private
* @return void
* @update date time
*/
function Tree ($value)
{
$this->setNode(0, -1, $value);
} // end func

/**
* Short description.
*
* Detail description
* @param none
* @global none
* @since 1.0
* @access private
* @return void
* @update date time
*/
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

/**
* Short description.
*
* Detail description
* @param none
* @global none
* @since 1.0
* @access private
* @return void
* @update date time
*/
function getList (&$tree, $root= 0)
{
foreach ($this->child[$root] as $key=>$id)
{
$tree[] = $id;

if ($this->child[$id]) $this->getList($tree, $id);
}
} // end func

/**
* Short description.
*
* Detail description
* @param none
* @global none
* @since 1.0
* @access private
* @return void
* @update date time
*/
function getValue ($id)
{
return $this->data[$id];
} // end func

/**
* Short description.
*
* Detail description
* @param none
* @global none
* @since 1.0
* @access private
* @return void
* @update date time
*/
function getLayer ($id, $space = false)
{
return $space?str_repeat($space, $this->layer[$id]):$this->layer[$id];
} // end func

/**
* Short description.
*
* Detail description
* @param none
* @global none
* @since 1.0
* @access private
* @return void
* @update date time
*/
function getParent ($id)
{
return $this->parent[$id];
} // end func

/**
* Short description.
*
* Detail description
* @param none
* @global none
* @since 1.0
* @access private
* @return void
* @update date time
*/
function getParents ($id)
{
while ($this->parent[$id] != -1)
{
$id = $parent[$this->layer[$id]] = $this->parent[$id];
}

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

return $parent;
} // end func

/**
* Short description.
*
* Detail description
* @param none
* @global none
* @since 1.0
* @access private
* @return void
* @update date time
*/
function getChild ($id)
{
return $this->child[$id];
} // end func

/**
* Short description.
*
* Detail description
* @param none
* @global none
* @since 1.0
* @access private
* @return void
* @update date time
*/
function getChilds ($id = 0)
{
$child = array($id);
$this->getList($child, $id);

return $child;
} // end func
} // end class

?>

--------------------------------------------------------------------------------

使用方法

PHP代碼:--------------------------------------------------------------------------------
//new Tree(根目錄的名字);
//根目錄的ID自動分配為0
$Tree = new Tree('根目錄');

//setNode(目錄ID,上級ID，目錄名字);
$Tree->setNode(1, 0, '目錄1');
$Tree->setNode(2, 0, '目錄2');
$Tree->setNode(3, 0, '目錄3');
$Tree->setNode(4, 3, '目錄3.1');
$Tree->setNode(5, 3, '目錄3.2');
$Tree->setNode(6, 3, '目錄3.3');
$Tree->setNode(7, 2, '目錄2.1');
$Tree->setNode(8, 2, '目錄2.2');
$Tree->setNode(9, 2, '目錄2.3');
$Tree->setNode(10, 6, '目錄3.3.1');
$Tree->setNode(11, 6, '目錄3.3.2');
$Tree->setNode(12, 6, '目錄3.3.3');

//getChilds(指定目錄ID);
//取得指定目錄下級目錄.如果沒有指定目錄就由根目錄開始
$category = $Tree->getChilds();

//遍曆輸出
foreach ($category as $key=>$id)
{
echo $Tree->getLayer($id, '|-').$Tree->getValue($id)."<br>\n";
}