php实现的树形结构数据存取类实例

本文实例讲述了php实现的树形结构数据存取类。分享给大家供大家参考。

具体实现代码如下：

复制代码 代码如下:
 

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
    
   
    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);
        }
    }
    
   
    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);
    }
    
   
    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()); 
    }
    
   
    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");
        }
    }
    
   
    private function _getSelf()
    {
        return $this;
    }
    
   
    public function getChild($id)
    {
        $data       = self::$_indexs[$id]->_child;
        $this->_data = $data;
        return $this;
    }
    
   
    public function getParent($id)
    {
        $data = self::$_indexs[$id]->_parent;
        $this->_data = $data;
        return $this;
    }
    
   
    public function getBrother($id)
    {
        $data = self::$_indexs[$id]->_parent->_child;
        $this->_data = $data;
        return $this;
    }
    
   
     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;
    }
    
   
    private function _getbaseInfo($obj)
    {
        $vars = get_object_vars($obj);
        $baseInfo['_info']  =  $vars['_info'];
        $baseInfo['_child'] =  $vars['_child'];
        return $baseInfo;
    }
    
   
    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;
    }
}
?>

希望本文所述对大家的PHP程序设计有所帮助。