使用PHPZip解压缩文件

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<?php
#
# PHPZip v1.2 by Sext ([emailprotected]) 2002-11-18
#     (Changed: 2003-03-01)
#
# Makes zip archive
#
# Based on "Zip file creation class",uses zLib
#
#

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,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
?>

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