xyzshop/helper/category_helper.php

<?php
/**
 * Created by PhpStorm.
 * User: stanley-king
 * Date: 16/5/9
 * Time: 下午9:06
 */

class category_helper
{
    private $file_name = '';
    private $mCategories = NULL;
    private $mCids = NULL;

    static private $stInstance = NULL;
    static public function instance()
    {
        if(self::$stInstance == NULL) {
            self::$stInstance = new category_helper();
        }
        return self::$stInstance;
    }

    private function __construct()
    {
        $this->mCids = array();
        $this->file_name = BASE_DATA_PATH . '/sales/category.xml';
        self::load_xml($this->file_name);
    }

    private function load_xml($file)
    {
        $xml = simplexml_load_file($file);
        if($xml === false) {
            throw new Exception("无法解析XML文件");
        }

        $this->mCategories = array();
        foreach($xml->children() as $xitem)
        {
            $item = array();
            $attrs = $xitem->attributes();

            $title = $attrs['title']->__toString();
            $pid = $attrs['id']->__toString();
            $cids = $attrs['cids']->__toString();
            $img = $attrs['img']->__toString();

            $item['title'] = $title;
            $item['id'] = $pid;
            $item['img'] = $img;

            $item['subitem'] = array();
            $this->add_cids($pid,$cids);

            foreach($xitem->children() as $xsubitem) {
                $subitem = array();
                $sattrs = $xsubitem->attributes();

                $title = $sattrs['title']->__toString();
                $sid = $sattrs['id']->__toString();
                $cids = $sattrs['cids']->__toString();
                $img = $sattrs['img']->__toString();

                $subitem['title'] = $title;
                $subitem['id'] = $sid;
                $subitem['img'] = $img;

                array_push($item['subitem'],$subitem);

                $this->add_cids($sid,$cids);
                $this->add_cids($pid,$cids);
            }

            array_push($this->mCategories,$item);
        }
    }

    private function add_cids($id,$cids)
    {
        if(!in_array($id,$this->mCids)) {
            $this->mCids[$id] = array();
        }
        $cids = explode(',',$cids);
        foreach($cids as $val)
        {
            $cur_cids = &$this->mCids[$id];
            if(!empty($val) && !in_array($val,$cur_cids)) {
                array_push($cur_cids,$val);
            }
        }
    }


    public function categories()
    {
        return $this->mCategories;
    }

    public function cids($id)
    {
        if(!in_array($id,$this->mCids)) {
            return array();
        } else {
            return $this->mCids[$id];
        }
    }
}