function getTmp(){    $file_name = ‘orderTemp.xlsx‘;    $file_path = dirname(__FILE__);    #判断一下文件是否存在    if(! file_exists($file_path. ‘/‘ .$file_name)){        echo "file not exists";        return;    }    #存在的话，只读方式打开    $fp = fopen($file_name,"r");    #获取文件大小    $file_size = filesize($file_name);    #让下载的文件名是中文    $file_name = iconv(‘UTF-8‘, ‘gbk‘, ‘订单表格模板.xlsx‘);    #粘贴头代码    header("Content-Type: application/octet-stream");    header("Accept-Ranges: bytes");    header("Accept-Length: $file_size");    header("Content-Disposition: attachment; filename=" . $file_name);    #设定一次读取的字节数    $buffer = 1024;    #存储文件到本地    while(! feof($fp)){        $file_data = fread($fp,$buffer);        echo $file_data;    }    fclose($fp);}