function unix2_dostime($unixtime = 0){
$timearray = ($unixtime == 0) ? getdate () : getdate($unixtime);
if ($timearray ['year'] < 1980){
$timearray ['year'] = 1980;
$timearray ['mon'] = 1;
$timearray ['mday'] = 1;
$timearray ['hours'] = 0;
$timearray ['minutes'] = 0;
$timearray ['seconds'] = 0;
}
return (($timearray ['year'] - 1980) << 25) | ($timearray ['mon'] << 21) | ($timearray ['mday'] << 16) | ($timearray ['hours'] << 11) | ($timearray ['minutes'] << 5) | ($timearray ['seconds'] >> 1);
}
function add_file($data,$name,$time = 0){
$name = str_replace('\','/',$name);

$dtime = dechex($this->unix2_dostime($time));
$hexdtime = '\x' . $dtime [6] . $dtime [7] . '\x' . $dtime [4] . $dtime [5] . '\x' . $dtime [2] . $dtime [3] . '\x' . $dtime [0] . $dtime [1];
eval('$hexdtime = "' . $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,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;
$fr .= pack('V',$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',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 ? $l : strlen($path) + 1;
while($v = @readdir($d)){
if($v == '.' || $v == '..'){
continue;
}
$v = $path . '/' . $v;
if(is_dir($v)){
$this->add_path($v,$l);
} else {
$this->add_file(file_get_contents($v),substr($v,$l));
}
}
}
function file(){
$data = implode('',$this->datasec);
$ctrldir = implode('',$this->ctrl_dir);
return $data . $ctrldir . $this->eof_ctrl_dir . pack('v',sizeof($this->ctrl_dir)) . pack('v',sizeof($this->ctrl_dir)) . pack('V',strlen($ctrldir)) . pack('V',strlen($data)) . "\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();
?>