$zip = new ZipArchive();

// 打开一个zip文档，ZipArchive::OVERWRITE：如果存在这样的文档，则覆盖；ZipArchive::CREATE：如果不存在，则创建

$res = $zip->open('test.zip', ZipArchive::OVERWRITE | ZipArchive::CREATE);

if($res)

{

    // 添加 a.txt 到压缩文档

    $zip->addFile('a.txt');

    // 添加一个字符串到压缩文档中的b.txt

    $zip->addFromString('b.txt', 'this is b.txt');

    // 添加一个空目录b到压缩文档

    $zip->addEmptyDir('b');

}

// 关闭打开的压缩文档

$zip->close();

 /**

  * @param $dir 目标目录路径

  * @param $zip ZipArchive类对象

  * @param $prev

  */

 function compressDir($dir, $zip, $prev='.')

 {

     $handler = opendir($dir);

     $basename = basename($dir);

     $zip->addEmptyDir($prev . '/' . $basename);

     while($file = readdir($handler))

     {

         $realpath = $dir . '/' . $file;

         if(is_dir($realpath))

         {

             if($file !== '.' && $file !== '..')

             {

                 $zip->addEmptyDir($prev . '/' . $basename . '/' . $file);

                 compressDir($realpath, $zip, $prev . '/' . $basename);

             }

         }else

         {

             $zip->addFile($realpath, $prev. '/' . $basename . '/' . $file);

         }

     }

     closedir($handler);

     return null;

 }

 $zip = new ZipArchive();

 $res = $zip->open('test.zip', ZipArchive::OVERWRITE | ZipArchive::CREATE);

 if($res)

 {

     compressDir('./test', $zip);

     $zip->close();

 }

$zip = new ZipArchive();

$res = $zip->open('test1.zip');

if($res)

{

    // 解压缩文件到指定目录

    $zip->extractTo('test');

    $zip->close();

}

header('Content-Type:text/html;charset=utf-8');

header('Content-disposition:attachment;filename=test.zip');

$filesize = filesize('./test.zip');

readfile('./test.zip');

header('Content-length:'.$filesize);

unlink('./test.zip');