$filename= date("YmdHis");
$zip = new ZipArchive();//使用本类，linux需开启zlib，windows需取消php_zip.dll前的注释
$zip->open($filename.".zip", ZipArchive::OVERWRITE); //$data 就是从数据库里面读出的数字
foreach( $data as $val){
   $attachfile = "E:\bysj\bysj".$val['fileaddr'].$val['filename']; //写硬路径，但建议用PHP环境变量
   $attachfile=iconv("UTF-8","GBK",$attachfile); //转码，是打包中文文档的关键
   $zip->addFile( $attachfile , basename($attachfile)); //压栈
}
$zip->close();//关闭
header("Content-type:text/html;charset=utf-8");//设置页面编号
header("Cache-Control: public");
header("Content-Description: File Transfer");
header('Content-disposition: attachment; filename='.basename($filename)); //文件名
header("Content-Type: application/zip"); //zip格式的
header("Content-Transfer-Encoding: binary"); //告诉浏览器，这是二进制文件
header('Content-Length: '. filesize($filename)); //告诉浏览器，文件大小
@readfile($filename.".zip");