PHP多个图片压缩成ZIP的方法

<?php
header("Content-type: text/html; charset=utf-8"); 
class zipfile {
 var $datasec = array ();
 var $ctrl_dir = array ();
 var $eof_ctrl_dir = "x50x4bx05x06x00x00x00x00";
 var $old_offset = 0;
 
 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){ 
  $name = urldecode($name);   
 //判断文件名中是否含有中文
 if (preg_match("/[x7f-xff]/", $name)) { 
 $name = $this->iconv_to_utf8($name,'GB2312');
 }
 
  $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 = "x50x4bx03x04";
  $fr .= "x14x00";
  $fr .= "x00x00";
  $fr .= "x08x00";
  $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 = "x50x4bx01x02";
  $cdrec .= "x00x00";
  $cdrec .= "x14x00";
  $cdrec .= "x00x00";
  $cdrec .= "x08x00";
  $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 ? $l : strlen($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)) . "x00x00";
 }
 
 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);
 }

 /**
 * 转码为UTF-8
 * @param $keyword 要转码的字符串
 */
 function iconv_to_utf8($keyword, $to='UTF-8'){
 $encode = mb_detect_encoding($keyword, array('ASCII','UTF-8','GBK','GB2312'));
 if($encode != $to){
 $keyword = iconv($encode, $to, $keyword);
 }
 return $keyword;
 }


}

$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
$filename = $filename;
$host = 'http://test.love11.com';
//$dir_name = $host.'/images/point_qrcode/';
$image = array(
 array('image_src' => 'test2.jpg', 'image_name' => '中文1.jpg'),
 array('image_src' => 'weixin.jpg', 'image_name' => '中文2.jpg'),
);

foreach($image as $v){ 
 $zip->add_file(file_get_contents($dir_name.urlencode($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();
?>