本文章來給大家分享一款不錯的樹形結構的php類代碼，各位朋友可參考。 代碼如下 復制代碼
<?php
/**
* Tanphp framework
*
*
* @category Tanphp
* @package Data_structure
* @copyright Copyright (c) 2012 譚博 tanbo.name
* @version $Id: Tree.php 25024 2012-11-26 22:22:22 tanbo $
*/
/**
* 樹形結構數據存取類
*
* 用於對樹形結構數據進行快速的存取
*
* @param array $arr 參數必須為標准的二維數組，包含索引字段（id）與表示樹形結構的字段(path),如example中所示
*
* @example <code>
* $arr = array(
* array( 'id' => 1, 'name' => 'php', 'path' => '1' ),
* array( 'id' => 3, 'name' => 'php1', 'path' => '1-3' ),
* array( 'id' => 2, 'name' => 'mysql', 'path' => '2' ),
* array( 'id' => 6, 'name' => 'mysql1', 'path' => '2-6' ),
* array( 'id' => 7, 'name' => 'mysql2', 'path' => '2-7' ),
* array( 'id' => 5, 'name' => 'php11', 'path' => '1-3-5' ),
* array( 'id' => 4, 'name' => 'php2', 'path' => '1-4' ),
* );
* $cate = new Tree($arr);
*
* $data = $cate->getChild(2);
*
* print_r($data->toArray());
* </code>
*
*/
class Tree
{
public $_info; //節點信息
public $_child = array(); //子節點
private $_parent; //父節點
private $_data; //當前操作的臨時數據
private static $_indexs = array(); //所有節點的索引
private static $_index_key = 'id'; //索引鍵
private static $_tree_key = 'path'; //樹形結構表達鍵
private static $_tree_delimiter = '-'; //屬性結構表達分割符
/**
* 構造函數
*
* @param array $arr
* @param boole $force_sort 如果為真，將會強制對$arr 進行排序
* @return void
*/
public function __construct(array $arr = array(), $force_sort=true)
{
if ($force_sort === true) {
$arr=$this->_array_sort($arr, self::$_tree_key);
}
if (!empty($arr)) {
$this->_init($arr);
}
}
/**
* 初始存儲樹形數據
*
* @param array $arr
* @return void
*/
private function _init(array $arr)
{
foreach ($arr as $item) {
$path = $item[self::$_tree_key];
$paths = explode(self::$_tree_delimiter, $path);
$count_paths = count($paths);
$parent_id = isset($paths[$count_paths-2]) ? $paths[$count_paths-2] : NULL;
if ( $count_paths>1 //如果有父級
&& array_key_exists($parent_id, self::$_indexs) //父級已經被存入索引
&& self::$_indexs[$parent_id] instanceof Tree //父級為Tree對象
) {
self::$_indexs[$parent_id]->addChild($item);
} elseif ($count_paths == 1) {
$this->addChild($item);
} else {
throw new Exception("path數據錯誤".var_export($item, true));
}
}
//print_r(self::$_indexs);
}
/**
* 添加子節點
*
* @param array $item
* @return void
*/
public function addChild(array $item, $parent = NULL)
{
$child = new Tree();
$child->_info = $item;
$child->_parent = $parent == NULL ? $this : $parent;
$child->_parent->_child[] = $child;
$this->_addIndex($item, $child->_getSelf());
}
/**
* 添加節點到索引
*
* @param array $item
* @param mix $value
* @return void
*/
private function _addIndex(array $item, $value)
{
if (array_key_exists(self::$_index_key, $item) && is_int($item[self::$_index_key])) {
self::$_indexs[$item[self::$_index_key]] = $value;
} else {
throw new Exception("id字段不存在或者不為字符串");
}
}
/**
* 獲取對自己的引用
*
* @return Tree object quote
*/
private function _getSelf()
{
return $this;
}
/**
* 獲取指定id的節點的子節點
*
* @param int $id
* @return Tree object
*/
public function getChild($id)
{
$data = self::$_indexs[$id]->_child;
$this->_data = $data;
return $this;
}
/**
* 獲取指定id的節點的父節點
*
* @param int $id
* @return Tree object
*/
public function getParent($id)
{
$data = self::$_indexs[$id]->_parent;
$this->_data = $data;
return $this;
}
/**
* 獲取指定id的節點的同級節點
*
* @param int $id
* @return Tree object
*/
public function getBrother($id)
{
$data = self::$_indexs[$id]->_parent->_child;
$this->_data = $data;
return $this;
}
/**
* 將Tree對象轉化為數組
*
* @param object $object
* @return array
*/
public function toArray($obj = NULL)
{
$obj = ($obj === NULL) ? $this->_data : $obj;
$arr = array();
$_arr = is_object($obj) ? $this->_getBaseInfo($obj) : $obj;
if (is_array($_arr)) {
foreach ($_arr as $key => $val){
$val = (is_array($val) || is_object($val)) ? $this->toArray($val) : $val;
$arr[$key] = $val;
}
} else {
throw new Exception("_arr不是數組");
}
return $arr;
}
/**
* 過濾_parent等字段，以免造成無限循環
*
* @param object $obj
* @return void
*/
private function _getBaseInfo($obj)
{
$vars = get_object_vars($obj);
$baseInfo['_info'] = $vars['_info'];
$baseInfo['_child'] = $vars['_child'];
return $baseInfo;
}
/**
* 二維數組排序
*
* 根據指定的鍵名對二維數組進行升序或者降序排列
*
* @param array $arr 二維數組
* @param string $keys
* @param string $type 必須為 asc或desc
* @throws 當參數非法時拋出異常
* @return 返回排序好的數組
*/
private function _array_sort(array $arr, $keys, $type = 'asc') {
if (!is_string($keys)) {
throw new Exception("非法參數keys:參數keys的類型必須為字符串");
}
$keysvalue = $new_array = array();
foreach ($arr as $k=>$v) {
if (!is_array($v) || !isset($v[$keys])) {
throw new Exception("參數arr不是二維數組或arr子元素中不存在鍵'{$keys}'");
}
$keysvalue[$k] = $v[$keys];
}
switch ($type) {
case 'asc':
asort($keysvalue);
break;
case 'desc':
arsort($keysvalue);
break;
default:
throw new Exception("非法參數type ：參數type的值必須為 'asc' 或 'desc'");
}
reset($keysvalue);
foreach ($keysvalue as $k=>$v) {
$new_array[$k] = $arr[$k];
}
return $new_array;
}
}
?>
