php树形结构数据存取实例类 |
时间:2015-01-23 来源:西部数据 作者:西部数据 |
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- <?php
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- class Tree
- {
- public $_info;
- public $_child = array();
- private $_parent;
- private $_data;
- private static $_indexs = array();
- private static $_index_key = 'id';
- private static $_tree_key = 'path';
- private static $_tree_delimiter = '-';
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- 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);
- }
- }
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- 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;
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- if ( $count_paths>1
- && array_key_exists($parent_id, self::$_indexs)
- && self::$_indexs[$parent_id] instanceof Tree
- ) {
- self::$_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));
- }
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- }
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- }
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- public function addChild(array $item, $parent = NULL)
- {
- $child = new Tree();
- $child->_info = $item;
- $child->_parent = $parent == NULL ? $this : $parent;
- $child->_parent->_child[] = $child;
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- $this->_addIndex($item, $child->_getSelf());
- }
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- 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");
- }
- }
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- private function _getSelf()
- {
- return $this;
- }
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- public function getChild($id)
- {
- $data = self::$_indexs[$id]->_child;
- $this->_data = $data;
- return $this;
- }
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- public function getParent($id)
- {
- $data = self::$_indexs[$id]->_parent;
- $this->_data = $data;
- return $this;
- }
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- public function getBrother($id)
- {
- $data = self::$_indexs[$id]->_parent->_child;
- $this->_data = $data;
- return $this;
- }
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- public function toArray($obj = NULL)
- {
- $obj = ($obj === NULL) ? $this->_data : $obj;
- $arr = array();
- $_arr = is_object($obj) ? $this->_getBaseInfo($obj) : $obj;
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- if (is_array($_arr)) {
- foreach ($_arr as $key => $val){
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- $val = (is_array($val) || is_object($val)) ? $this->toArray($val) : $val;
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- $arr[$key] = $val;
- }
- } else {
- throw new Exception("_arr不是数组");
- }
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- return $arr;
- }
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- private function _getBaseInfo($obj)
- {
- $vars = get_object_vars($obj);
- $baseInfo['_info'] = $vars['_info'];
- $baseInfo['_child'] = $vars['_child'];
- return $baseInfo;
- }
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- 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];
- }
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- switch ($type) {
- case 'asc':
- asort($keysvalue);
- break;
- case 'desc':
- arsort($keysvalue);
- break;
- default:
- throw new Exception("非法参数type :参数type的值必须为 'asc' 或 'desc'");
- }
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- reset($keysvalue);
- foreach ($keysvalue as $k=>$v) {
- $new_array[$k] = $arr[$k];
- }
- return $new_array;
- }
-
- }
- ?>
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