<"\x50\x4b\x05\x06\x00\x00\x00\x00";
  var $old_offset = 0;
  
  function unix2_dostime($unixtime = 0){
    $timearray = ($unixtime == 0) "' . $hexdtime . '";');
    
    $fr = "\x50\x4b\x03\x04";
    $fr .= "\x14\x00";
    $fr .= "\x00\x00";
    $fr .= "\x08\x00";
    $fr .= $hexdtime;
    
    $unc_len = strlen($data);
    $crc = crc32($data);
    $zdata = gzcompress($data);
    $zdata = substr(substr($zdata, 0, strlen($zdata)- 4), 2);
    $c_len = strlen($zdata);
    $fr .= pack('V', $crc);
    $fr .= pack('V', $c_len);
    $fr .= pack('V', $unc_len);
    $fr .= pack('v', strlen($name));
    $fr .= pack('v', 0);
    $fr .= $name;
    
    $fr .= $zdata;
    $fr .= pack('V', $crc);
    $fr .= pack('V', $c_len);
    $fr .= pack('V', $unc_len);
    
    $this->datasec [] = $fr;
    
    $cdrec = "\x50\x4b\x01\x02";
    $cdrec .= "\x00\x00";
    $cdrec .= "\x14\x00";
    $cdrec .= "\x00\x00";
    $cdrec .= "\x08\x00";
    $cdrec .= $hexdtime;
    $cdrec .= pack('V', $crc);
    $cdrec .= pack('V', $c_len);
    $cdrec .= pack('V', $unc_len);
    $cdrec .= pack('v', strlen($name));
    $cdrec .= pack('v', 0);
    $cdrec .= pack('v', 0);
    $cdrec .= pack('v', 0);
    $cdrec .= pack('v', 0);
    $cdrec .= pack('V', 32);
    
    $cdrec .= pack('V', $this->old_offset);
    $this->old_offset += strlen($fr);
    
    $cdrec .= $name;
    
    $this->ctrl_dir[] = $cdrec;
  }
  function add_path($path, $l = 0){
    $d = @opendir($path);
    $l = $l > 0 "\x00\x00";
  }
  
  function add_files($files){
    foreach($files as $file){
      if (is_file($file)){
        $data = implode("", file($file));
        $this->add_file($data, $file);
      }
    }
  }
  function output($file){
    $fp = fopen($file, "w");
    fwrite($fp, $this->file ());
    fclose($fp);
  }
} 

//下面是实例操作过程：
$dfile = tempnam('/tmp', 'tmp');//产生一个临时文件，用于缓存下载文件
$zip = new zipfile();
//----------------------
$filename = 'image.zip'; //下载的默认文件名

//以下是需要下载的图片数组信息，将需要下载的图片信息转化为类似即可
$image = array(
  array('image_src' => 'pic1.jpg', 'image_name' => '图片1.jpg'),
  array('image_src' => 'pic2.jpg', 'image_name' => 'pic/图片2.jpg'),
);

foreach($image as $v){
  $zip->add_file(file_get_contents($v['image_src']), $v['image_name']);
  // 添加打包的图片，第一个参数是图片内容，第二个参数是压缩包里面的显示的名称, 可包含路径
  // 或是想打包整个目录 用 $zip->add_path($image_path);
}
//----------------------
$zip->output($dfile);

// 下载文件
ob_clean();
header('Pragma: public');
header('Last-Modified:'.gmdate('D, d M Y H:i:s') . 'GMT');
header('Cache-Control:no-store, no-cache, must-revalidate');
header('Cache-Control:pre-check=0, post-check=0, max-age=0');
header('Content-Transfer-Encoding:binary');
header('Content-Encoding:none');
header('Content-type:multipart/form-data');
header('Content-Disposition:attachment; filename="'.$filename.'"'); //设置下载的默认文件名
header('Content-length:'. filesize($dfile));
$fp = fopen($dfile, 'r');
while(connection_status() == 0 && $buf = @fread($fp, 8192)){
  echo $buf;
}
fclose($fp);
@unlink($dfile);
@flush();
@ob_flush();
exit();
?>