一个PHP压缩类，在线压缩文件

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　　PHP压缩类：用于在线压缩文件、文档、目录等，附有使用方法，不想了解类原理的可直接按使用方法调用该类：

<?php
//PHP压缩类代码开始
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 $old_offset = 0;
function unix2DosTime($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) | ($timearray['seconds'] >> 1);
}
function addFile($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"; 
       $fr .= "x00x00"; 
       $fr .= "x08x00";
       $fr .= $hexdtime; 
       $unc_len = strlen($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);
       $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;
       $new_offset        = strlen(implode('', $this->datasec));
       $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 = $new_offset;
       $cdrec .= $name;
       $this -> ctrl_dir[] = $cdrec;
}
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";
}
} //PHP压缩类结束
?>

　　代码帖完了，那么使用这个压缩类呢?下面告诉你三种调用方法：

<?php
//不管哪种方法，都需要先新建zip类
$z = new PHPZip();

//方法一：
$z -> Zip("", "out1.zip"); //添加当前目录和子目录下的所有文件

//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
?>

　　到此PHP压缩类和调用方法都告诉你了，快动手测试一下吧，希望你会得到惊喜。

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