Definition und Verwendung der PHPZip-Klasse

<?php
//
// PHPZip v1.2 by Sext (sext@neud.net) 
//
// Makes zip archive
//
// Based on "Zip file creation class", uses zLib
//
//
class PHPZip
{
function Zip($dir, $zipfilename)
{
    if (@function_exists(&#39;gzcompress&#39;))
    {
     $curdir = getcwd();
     if (is_array($dir))
     {
          $filelist = $dir;
     }
     else
     {
      $filelist = $this -> GetFileList($dir);
     }
     if ((!empty($dir))&&(!is_array($dir))&&(file_exists($dir))) chdir($dir);
     else chdir($curdir);
     if (count($filelist)>0)
     {
      foreach($filelist as $filename)
      {
          if (is_file($filename))
          {
           $fd = fopen ($filename, "r");
           $content = fread ($fd, filesize ($filename));
           fclose ($fd);
           if (is_array($dir)) $filename = basename($filename);
           $this -> addFile($content, $filename);
          }
      }
      $out = $this -> file();
      chdir($curdir);
      $fp = fopen($zipfilename, "w");
      fwrite($fp, $out, strlen($out));
      fclose($fp);
     }
     return 1;
    }
    else return 0;
}
function GetFileList($dir)
{
    if (file_exists($dir))
    {
     $args = func_get_args();
     $pref = $args[1];
     $dh = opendir($dir);
     while($files = readdir($dh))
     {
      if (($files!=".")&&($files!=".."))
      {
          if (is_dir($dir.$files))
          {
           $curdir = getcwd();
           chdir($dir.$files);
           $file = array_merge($file, $this -> GetFileList("", "$pref$files/"));
           chdir($curdir);
          }
          else $file[]=$pref.$files;
      }
     }
     closedir($dh);
    }
    return $file;
}
var $datasec  = array();
var $ctrl_dir   = array();
var $eof_ctrl_dir = "x50x4bx05x06x00x00x00x00";
var $old_offset = 0;
/**
  * Converts an Unix timestamp to a four byte DOS date and time format (date
  * in high two bytes, time in low two bytes allowing magnitude comparison).
  *
  * @param  integer  the current Unix timestamp
  *
  * @return integer  the current date in a four byte DOS format
  *
  * @access private
  */
function unix2DosTime($unixtime = 0) {
    $timearray = ($unixtime == 0) ? getdate() : getdate($unixtime);
    if ($timearray[&#39;year&#39;] < 1980) {
     $timearray[&#39;year&#39;] = 1980;
     $timearray[&#39;mon&#39;]   = 1;
     $timearray[&#39;mday&#39;] = 1;
     $timearray[&#39;hours&#39;] = 0;
     $timearray[&#39;minutes&#39;] = 0;
     $timearray[&#39;seconds&#39;] = 0;
    } // end if
    return (($timearray[&#39;year&#39;] - 1980) << 25) | ($timearray[&#39;mon&#39;] << 21) | ($timearray[&#39;mday&#39;] << 16) |
      ($timearray[&#39;hours&#39;] << 11) | ($timearray[&#39;minutes&#39;] << 5) | ($timearray[&#39;seconds&#39;] >> 1);
} // end of the &#39;unix2DosTime()&#39; method
/**
  * Adds "file" to archive
  *
  * @param  string file contents
  * @param  string name of the file in the archive (may contains the path)
  * @param  integer  the current timestamp
  *
  * @access public
  */
function addFile($data, $name, $time = 0)
{
    $name   = str_replace(&#39;&#39;, &#39;/&#39;, $name);
 
    $dtime = dechex($this->unix2DosTime($time));
    $hexdtime = &#39;x&#39; . $dtime[6] . $dtime[7]
        . &#39;x&#39; . $dtime[4] . $dtime[5]
        . &#39;x&#39; . $dtime[2] . $dtime[3]
        . &#39;x&#39; . $dtime[0] . $dtime[1];
    eval(&#39;$hexdtime = "&#39; . $hexdtime . &#39;";&#39;);
    $fr = "x50x4bx03x04";
    $fr .= "x14x00";     // ver needed to extract
    $fr .= "x00x00";     // gen purpose bit flag
    $fr .= "x08x00";     // compression method
    $fr .= $hexdtime;     // last mod time and date
 
    // "local file header" segment
    $unc_len = strlen($data);
    $crc   = crc32($data);
    $zdata = gzcompress($data);
    $c_len = strlen($zdata);
    $zdata = substr(substr($zdata, 0, strlen($zdata) - 4), 2); // fix crc bug
    $fr  .= pack(&#39;V&#39;, $crc);     // crc32
    $fr  .= pack(&#39;V&#39;, $c_len);      // compressed filesize
    $fr  .= pack(&#39;V&#39;, $unc_len);    // uncompressed filesize
    $fr  .= pack(&#39;v&#39;, strlen($name)); // length of filename
    $fr  .= pack(&#39;v&#39;, 0);       // extra field length
    $fr  .= $name;
    // "file data" segment
    $fr .= $zdata;
    // "data descriptor" segment (optional but necessary if archive is not
    // served as file)
    $fr .= pack(&#39;V&#39;, $crc);         // crc32
    $fr .= pack(&#39;V&#39;, $c_len);       // compressed filesize
    $fr .= pack(&#39;V&#39;, $unc_len);     // uncompressed filesize
    // add this entry to array
    $this -> datasec[] = $fr;
    $new_offset    = strlen(implode(&#39;&#39;, $this->datasec));
    // now add to central directory record
    $cdrec = "x50x4bx01x02";
    $cdrec .= "x00x00";       // version made by
    $cdrec .= "x14x00";       // version needed to extract
    $cdrec .= "x00x00";       // gen purpose bit flag
    $cdrec .= "x08x00";       // compression method
    $cdrec .= $hexdtime;         // last mod time & date
    $cdrec .= pack(&#39;V&#39;, $crc);      // crc32
    $cdrec .= pack(&#39;V&#39;, $c_len);    // compressed filesize
    $cdrec .= pack(&#39;V&#39;, $unc_len);  // uncompressed filesize
    $cdrec .= pack(&#39;v&#39;, strlen($name) ); // length of filename
    $cdrec .= pack(&#39;v&#39;, 0 );     // extra field length
    $cdrec .= pack(&#39;v&#39;, 0 );     // file comment length
    $cdrec .= pack(&#39;v&#39;, 0 );     // disk number start
    $cdrec .= pack(&#39;v&#39;, 0 );     // internal file attributes
    $cdrec .= pack(&#39;V&#39;, 32 );     // external file attributes - &#39;archive&#39; bit set
    $cdrec .= pack(&#39;V&#39;, $this -> old_offset ); // relative offset of local header
    $this -> old_offset = $new_offset;
    $cdrec .= $name;
    // optional extra field, file comment goes here
    // save to central directory
    $this -> ctrl_dir[] = $cdrec;
} // end of the &#39;addFile()&#39; method
/**
  * Dumps out file
  *
  * @return  string  the zipped file
  *
  * @access public
  */
function file()
{
    $data = implode(&#39;&#39;, $this -> datasec);
    $ctrldir = implode(&#39;&#39;, $this -> ctrl_dir);
 
    return
     $data .
     $ctrldir .
     $this -> eof_ctrl_dir .
     pack(&#39;v&#39;, sizeof($this -> ctrl_dir)) .  // total # of entries "on this disk"
     pack(&#39;v&#39;, sizeof($this -> ctrl_dir)) .  // total # of entries overall
     pack(&#39;V&#39;, strlen($ctrldir)) .      // size of central dir
     pack(&#39;V&#39;, strlen($data)) .       // offset to start of central dir
     "x00x00";               // .zip file comment length
} // end of the &#39;file()&#39; method
} // end of the &#39;PHPZip&#39; class
?>

<?php
$z = new PHPZip(); //新建立一个zip的类
//方法一：
$z -> Zip("", "out1.zip"); //添加当前目录和子目录下的所有档案
//方法二：
$files=array(&#39;1.txt&#39;,&#39;gb.txt&#39;);
$files[]=&#39;5.txt&#39;;
$z -> Zip($files, "out2.zip"); //添加文件列表
//方法三：
$z -> Zip("/usr/local/sext/", "out3.zip"); //添加指定目录
?>