Method of compressing multiple PHP images into ZIP

<?php
header("Content-type: text/html; charset=utf-8"); 
class zipfile {
 var $datasec = array ();
 var $ctrl_dir = array ();
 var $eof_ctrl_dir = "\x50\x4b\x05\x06\x00\x00\x00\x00";
 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);   
 //Determine whether the file name contains Chinese 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 = "\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 ? $l : strlen($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);
 }

 /**
  * Transcoded to UTF-8
  * @param $keyword string to be transcoded
  */
 function iconv_to_utf8($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;
 }


}

$dfile = tempnam('/tmp', 'tmp');// Generate a temporary file to cache downloaded files$zip = new zipfile();

 


//----------------------
$filename = ''; //Downloaded default file name$filename = $filename;
$host = 'http://test.';
//$dir_name = $host.'/images/point_qrcode/';
$image = array(
 array('image_src' => '', 'image_name' => 'Chinese'),
 array('image_src' => '', 'image_name' => 'Chinese'),
);

foreach($image as $v){ 
 $zip->add_file(file_get_contents($dir_name.urlencode($v['image_src'])), $v['image_name']);
 // Add packaged image. The first parameter is the image content. The second parameter is the name of the displayed in the compressed package. It can include the path. // Or if you want to package the entire directory, use $zip->add_path($image_path);}
//----------------------
$zip->output($dfile);
// Download the fileob_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="'.$filename.'"'); //Set the downloaded default file nameheader('Content-length:'. filesize($dfile));
$fp = fopen($dfile, 'r');
while(connection_status() == 0 && $buf = @fread($fp, 8192)){
 echo $buf;
}
fclose($fp);
@unlink($dfile);
@flush();
@ob_flush();
exit();
?>