/* 获取价格分级 */
    if ($cat['grade'] == 0  && $cat['parent_id'] != 0)
    {
        $cat['grade'] = get_parent_grade($cat_id); //如果当前分类级别为空，取最近的上级分类
    }

    if ($cat['grade'] > 1)
    {
        /* 需要价格分级 */

        /*
            算法思路：
                1、当分级大于1时，进行价格分级
                2、取出该类下商品价格的最大值、最小值
                3、根据商品价格的最大值来计算商品价格的分级数量级：
                        价格范围(不含最大值)    分级数量级
                        0-0.1                   0.001
                        0.1-1                   0.01
                        1-10                    0.1
                        10-100                  1
                        100-1000                10
                        1000-10000              100
                4、计算价格跨度：
                        取整((最大值-最小值) / (价格分级数) / 数量级) * 数量级
                5、根据价格跨度计算价格范围区间
                6、查询数据库

            可能存在问题：
                1、
                由于价格跨度是由最大值、最小值计算出来的
                然后再通过价格跨度来确定显示时的价格范围区间
                所以可能会存在价格分级数量不正确的问题
                该问题没有证明
                2、
                当价格=最大值时，分级会多出来，已被证明存在
        */

        $sql = "SELECT min(g.shop_price) AS min, max(g.shop_price) as max ".
               " FROM " . $ecs->table('goods'). " AS g ".
               " WHERE ($children OR " . get_extension_goods($children) . ') AND g.is_delete = 0 AND g.is_on_sale = 1 AND g.is_alone_sale = 1  ';
               //获得当前分类下商品价格的最大值、最小值

        $row = $db->getRow($sql);

        // 取得价格分级最小单位级数，比如，千元商品最小以100为级数
        $price_grade = 0.0001;
        for($i=-2; $i<= log10($row['max']); $i++)
        {
            $price_grade *= 10;
        }

        //跨度
        $dx = ceil(($row['max'] - $row['min']) / ($cat['grade']) / $price_grade) * $price_grade;
        if($dx == 0)
        {
            $dx = $price_grade;
        }

        for($i = 1; $row['min'] > $dx * $i; $i ++);

        for($j = 1; $row['min'] > $dx * ($i-1) + $price_grade * $j; $j++);
        $row['min'] = $dx * ($i-1) + $price_grade * ($j - 1);

        for(; $row['max'] >= $dx * $i; $i ++);
        $row['max'] = $dx * ($i) + $price_grade * ($j - 1);

        $sql = "SELECT (FLOOR((g.shop_price - $row[min]) / $dx)) AS sn, COUNT(*) AS goods_num  ".
               " FROM " . $ecs->table('goods') . " AS g ".
               " WHERE ($children OR " . get_extension_goods($children) . ') AND g.is_delete = 0 AND g.is_on_sale = 1 AND g.is_alone_sale = 1 '.
               " GROUP BY sn ";

        $price_grade = $db->getAll($sql);

        foreach ($price_grade as $key=>$val)
        {
            $temp_key = $key + 1;
            $price_grade[$temp_key]['goods_num'] = $val['goods_num'];
            $price_grade[$temp_key]['start'] = $row['min'] + round($dx * $val['sn']);
            $price_grade[$temp_key]['end'] = $row['min'] + round($dx * ($val['sn'] + 1));
            $price_grade[$temp_key]['price_range'] = $price_grade[$temp_key]['start'] . '&nbsp;-&nbsp;' . $price_grade[$temp_key]['end'];
            $price_grade[$temp_key]['formated_start'] = price_format($price_grade[$temp_key]['start']);
            $price_grade[$temp_key]['formated_end'] = price_format($price_grade[$temp_key]['end']);
            $price_grade[$temp_key]['url'] = build_uri('category', array('cid'=>$cat_id, 'bid'=>$brand, 'price_min'=>$price_grade[$temp_key]['start'], 'price_max'=> $price_grade[$temp_key]['end'], 'filter_attr'=>$filter_attr_str), $cat['cat_name']);

            /* 判断价格区间是否被选中 */
            if (isset($_REQUEST['price_min']) && $price_grade[$temp_key]['start'] == $price_min && $price_grade[$temp_key]['end'] == $price_max)
            {
                $price_grade[$temp_key]['selected'] = 1;
            }
            else
            {
                $price_grade[$temp_key]['selected'] = 0;
            }
        }

        $price_grade[0]['start'] = 0;
        $price_grade[0]['end'] = 0;
        $price_grade[0]['price_range'] = $_LANG['all_attribute'];
        $price_grade[0]['url'] = build_uri('category', array('cid'=>$cat_id, 'bid'=>$brand, 'price_min'=>0, 'price_max'=> 0, 'filter_attr'=>$filter_attr_str), $cat['cat_name']);
        $price_grade[0]['selected'] = empty($price_max) ? 1 : 0;

        $smarty->assign('price_grade',     $price_grade);

    }

/* 获取价格分级_新   */
 if($cat['grade_define'])
 {
 $price_grade=array();
 $price_grade[0]['start'] = 0;
    $price_grade[0]['end'] = 0;
    $price_grade[0]['price_range'] = $_LANG['all_attribute'];
    $price_grade[0]['url'] = build_uri('category', array('cid'=>$cat_id, 'bid'=>$brand,
  'price_min'=>0, 'price_max'=> 0, 'filter_attr'=>$filter_attr_str), $cat['cat_name']);
    $price_grade[0]['selected'] = empty($price_max) ? 1 : 0;

 $grade_temp=explode(",", $cat['grade_define']);
 foreach($grade_temp as $grade_temp_key=>$grade_temp_val)
 {
  $grade_temp_key2=$grade_temp_key+1;
  $grade_temp=explode("-", $grade_temp_val);
  $price_grade[$grade_temp_key2]['start']=intval($grade_temp[0]);
  $price_grade[$grade_temp_key2]['end']=$grade_temp[1] ?
   intval($grade_temp[1]) : "999999999";
  $price_grade[$grade_temp_key2]['price_range'] = $grade_temp_val;
  $price_grade[$grade_temp_key2]['url'] = build_uri('category', array('cid'=>$cat_id,
   'bid'=>$brand, 'price_min'=>$price_grade[$grade_temp_key2]['start'],
   'price_max'=> $price_grade[$grade_temp_key2]['end'],
   'filter_attr'=>$filter_attr_str), $cat['cat_name']);
        /* 判断价格区间是否被选中 */
            if (isset($_REQUEST['price_min'])
    && $price_grade[$grade_temp_key2]['start'] == $price_min
    && $price_grade[$grade_temp_key2]['end'] == $price_max)
            {
                $price_grade[$grade_temp_key2]['selected'] = 1;
            }
            else
            {
                $price_grade[$grade_temp_key2]['selected'] = 0;
            }
 }
 $smarty->assign('price_grade',     $price_grade);
 }

return $GLOBALS['db']->getRow('SELECT cat_name, keywords, cat_desc, style, grade, grade_define, filter_attr, parent_id FROM ' . $GLOBALS['ecs']->table('category') .
        " WHERE cat_id = '$cat_id'");