PHPZip的使用

class PHPZip
{
function Zip($dir, $zipfilename)
{
       if (@function_exists('gzcompress'))
       {
         $curdir = getcwd();
         if (is_array($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['year'] < 1980) {
     $timearray['year'] = 1980;
     $timearray['mon']     = 1;
     $timearray['mday'] = 1;
     $timearray['hours'] = 0;
     $timearray['minutes'] = 0;
     $timearray['seconds'] = 0;
   } // end if

   return (($timearray['year'] - 1980) << 25) | ($timearray['mon'] << 21) | ($timearray['mday'] << 16) |
        ($timearray['hours'] << 11) | ($timearray['minutes'] << 5) | ($timearray['seconds'] >> 1);
 
} // end of the 'unix2DosTime()' 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('', '/', $name);

   $dtime = dechex($this->unix2DosTime($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";          // 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('V', $crc);          // crc32
   $fr    .= pack('V', $c_len);           // compressed filesize
   $fr    .= pack('V', $unc_len);       // uncompressed filesize
   $fr    .= pack('v', strlen($name)); // length of filename
   $fr    .= pack('v', 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('V', $crc);                 // crc32
   $fr .= pack('V', $c_len);             // compressed filesize
   $fr .= pack('V', $unc_len);          // uncompressed filesize

   // add this entry to array
   $this -> datasec[] = $fr;
   $new_offset        = strlen(implode('', $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('V', $crc);           // crc32
   $cdrec .= pack('V', $c_len);       // compressed filesize
   $cdrec .= pack('V', $unc_len);    // uncompressed filesize
   $cdrec .= pack('v', strlen($name) ); // length of filename
   $cdrec .= pack('v', 0 );          // extra field length
   $cdrec .= pack('v', 0 );          // file comment length
   $cdrec .= pack('v', 0 );          // disk number start
   $cdrec .= pack('v', 0 );          // internal file attributes
   $cdrec .= pack('V', 32 );          // external file attributes - 'archive' bit set

   $cdrec .= pack('V', $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 'addFile()' method
/**

* Dumps out file
*
* @return   string   the zipped file
*
* @access public
*/
 
function file()
{
       $data = implode('', $this -> datasec);
       $ctrldir = implode('', $this -> ctrl_dir);

   return
     $data .
     $ctrldir .
     $this -> eof_ctrl_dir .
     pack('v', sizeof($this -> ctrl_dir)) .   // total # of entries "on this disk"
     pack('v', sizeof($this -> ctrl_dir)) .   // total # of entries overall
     pack('V', strlen($ctrldir)) .           // size of central dir
     pack('V', strlen($data)) .              // offset to start of central dir
     "x00x00";                             // .zip file comment length
 
} // end of the 'file()' method
} // end of the 'PHPZip' class
?>
<?php
//使用方法
$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('1.txt','gb.txt');
$files[]='5.txt';
$z -> Zip($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
?></pre>