导出excel

/**
     * 导出数据为excel表格
     *@param $data    一个二维数组,结构如同从数据库查出来的数组
     *@param $title   excel的第一行标题,一个数组,如果为空则没有标题
     *@param $filename 下载的文件名
     */
    public static function exportexcel($data=array(),$title=array(),$filename='report'){
        header("Content-type:application/octet-stream;charset=utf-8");
        header("Accept-Ranges:bytes");
        header("Content-type:application/vnd.ms-excel");
        header("Content-Disposition:attachment;filename=".$filename.".xls");
        header("Pragma: no-cache");
        header("Expires: 0");
        //导出xls 开始
        if (!empty($title)){
            foreach ($title as $k => $v) {
                $title[$k]=iconv("UTF-8", "GB2312",$v);
            }
            $title= implode("\t", $title);
            echo "$title\n";
        }
        if (!empty($data)){
            foreach($data as $key=>$val){
                foreach ($val as $ck => $cv) {
                    $data[$key][$ck]=iconv("UTF-8", "GB2312", $cv);
                }
                $data[$key]=implode("\t", $data[$key]);
    
            }
            echo implode("\n",$data);
        }
    }