<?php
namespace tools;
/**

 * @name PHPTree

 * @author crazymus < QQ:291445576 >

 * @des PHP生成树形结构,无限多级分类

 * @version 1.2.0

 * @Licensed ( http://www.apache.org/licenses/LICENSE-2.0 )

 * @updated 2015-08-26
 */
class Phptree
{
    protected static $config = array(
        /* 主键 */
        'primary_key' 	=> 'id',
        /* 父键 */
        'parent_key'  	=> 'parent_id',
        /* 展开属性 */
        'expanded_key'  => 'expanded',
        /* 叶子节点属性 */
        'leaf_key'      => 'leaf',
        /* 孩子节点属性 */
        'children_key'  => 'children',
        /* 是否展开子节点 */
        'expanded'    	=> false
    );
    
    /* 结果集 */
    protected static $result = array();
    
    /* 层次暂存 */
    protected static $level = array();
    /**

     * @name 生成树形结构

     * @param array 二维数组

     * @return mixed 多维数组

     */
    public static function makeTree($data, $options=array())
    {
        $dataset = self::buildData($data, $options);
        $r = self::makeTreeCore(0, $dataset, 'normal');
        return $r;
    }
    
    /* 生成线性结构, 便于HTML输出, 参数同上 */
    public static function makeTreeForHtml($data, $options=array())
    {
        $dataset = self::buildData($data, $options);
        $r = self::makeTreeCore(0, $dataset, 'linear');
        return $r;
    }
    
    /* 格式化数据, 私有方法 */
    private static function buildData($data, $options)
    {
        $config = array_merge(self::$config, $options);
        self::$config = $config;
        extract($config);

        $r = array();
        foreach ($data as $item) {
            $id = $item[$primary_key];
            $parent_id = $item[$parent_key];
            $r[$parent_id][$id] = $item;
        }
        
        return $r;
    }
    
    /* 生成树核心, 私有方法  */
    private static function makeTreeCore($index, $data, $type='linear')
    {
        extract(self::$config);
        foreach ($data[$index] as $id=>$item) {
            if ($type=='normal') {
                if (isset($data[$id])) {
                    $item[$expanded_key]= self::$config['expanded'];
                    $item[$children_key]= self::makeTreeCore($id, $data, $type);
                } else {
                    $item[$leaf_key]= true;
                }
                $r[] = $item;
            } elseif ($type=='linear') {
                $parent_id = $item[$parent_key];
                self::$level[$id] = $index==0?0:self::$level[$parent_id]+1;
                $item['level'] = self::$level[$id];
                self::$result[] = $item;
                if (isset($data[$id])) {
                    self::makeTreeCore($id, $data, $type);
                }
                
                $r = self::$result;
            }
        }
        return $r;
    }
}