- <?php
- /**
- * Tanphp framework
- *
- *
- * @category Tanphp
- * @package Data_structure
- * @copyright Copyright (c) 2012 谭博 tanbo.name
- * @version $Id: Tree.php 25024 2012-11-26 22:22:22 tanbo $
- */
- /**
- * 树形结构数据存取类
- *
- * 用于对树形结构数据进行快速的存取
- *
- * @param array $arr 参数必须为标准的二维数组,包含索引字段(id)与表示树形结构的字段(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; //节点信息
- public $_child = array(); //子节点
- private $_parent; //父节点
- private $_data; //当前操作的临时数据
- private static $_indexs = array(); //所有节点的索引
- private static $_index_key = 'id'; //索引键
- private static $_tree_key = 'path'; //树形结构表达键
- private static $_tree_delimiter = '-'; //属性结构表达分割符
- /**
- * 构造函数
- *
- * @param array $arr
- * @param boole $force_sort 如果为真,将会强制对$arr 进行排序
- * @return void
- */
- public function __construct(array $arr = array(), $force_sort=true)
- {
- if ($force_sort === true) {
- $arr=$this->_array_sort($arr, self::$_tree_key);
- }
- if (!emptyempty($arr)) {
- $this->_init($arr);
- }
- }
- /**
- * 初始存储树形数据
- *
- * @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 ( $count_paths>1 //如果有父级
- && array_key_exists($parent_id, self::$_indexs) //父级已经被存入索引
- && self::$_indexs[$parent_id] instanceof Tree //父级为Tree对象
- ) {
- self::$_indexs[$parent_id]->addChild($item);
- } elseif ($count_paths == 1) {
- $this->addChild($item);
- } else {
- throw new Exception("path数据错误".var_export($item, true));
- }
- }
- //print_r(self::$_indexs);
- }
- /**
- * 添加子节点
- *
- * @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());
- }
- /**
- * 添加节点到索引
- *
- * @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字段不存在或者不为字符串");
- }
- }
- /**
- * 获取对自己的引用
- *
- * @return Tree object quote
- */
- private function _getSelf()
- {
- return $this;
- }
- /**
- * 获取指定id的节点的子节点
- *
- * @param int $id
- * @return Tree object
- */
- public function getChild($id)
- {
- $data = self::$_indexs[$id]->_child;
- $this->_data = $data;
- return $this;
- }
- /**
- * 获取指定id的节点的父节点
- *
- * @param int $id
- * @return Tree object
- */
- public function getParent($id)
- {
- $data = self::$_indexs[$id]->_parent;
- $this->_data = $data;
- return $this;
- }
- /**
- * 获取指定id的节点的同级节点
- *
- * @param int $id
- * @return Tree object
- */
- public function getBrother($id)
- {
- $data = self::$_indexs[$id]->_parent->_child;
- $this->_data = $data;
- return $this;
- }
- /**
- * 将Tree对象转化为数组
- *
- * @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不是数组");
- }
- return $arr;
- }
- /**
- * 过滤_parent等字段,以免造成无限循环
- *
- * @param object $obj
- * @return void
- */
- private function _getBaseInfo($obj)
- {
- $vars = get_object_vars($obj);
- $baseInfo['_info'] = $vars['_info'];
- $baseInfo['_child'] = $vars['_child'];
- return $baseInfo;
- }
- /**
- * 二维数组排序
- *
- * 根据指定的键名对二维数组进行升序或者降序排列
- *
- * @param array $arr 二维数组
- * @param string $keys
- * @param string $type 必须为 asc或desc
- * @throws 当参数非法时抛出异常
- * @return 返回排序好的数组
- */
- private function _array_sort(array $arr, $keys, $type = 'asc') {
- if (!is_string($keys)) {
- throw new Exception("非法参数keys:参数keys的类型必须为字符串");
- }
- $keysvalue = $new_array = array();
- foreach ($arr as $k=>$v) {
- if (!is_array($v) || !isset($v[$keys])) {
- throw new Exception("参数arr不是二维数组或arr子元素中不存在键'{$keys}'");
- }
- $keysvalue[$k] = $v[$keys];
- }
- switch ($type) {
- case 'asc':
- asort($keysvalue);
- break;
- case 'desc':
- arsort($keysvalue);
- break;
- default:
- throw new Exception("非法参数type :参数type的值必须为 'asc' 或 'desc'");
- }
- reset($keysvalue);
- foreach ($keysvalue as $k=>$v) {
- $new_array[$k] = $arr[$k];
- }
- return $new_array;
- }
- }
- ?>
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