PHP 压缩文件夹的类代码

<?php 
/* 
$Id: PHPZip.php 
*/ 
class PHPZip { 
var $datasec = array(); 
var $ctrl_dir = array(); 
var $eof_ctrl_dir = "\x50\x4b\x05\x06\x00\x00\x00\x00"; 
var $old_offset = 0; 
function Zip($dir, $zipfilename) { 
if (@function_exists('gzcompress')) { 
@set_time_limit("0"); 
$this->openFile($dir,$dir); 
$out = $this -> filezip(); 
$fp = fopen($zipfilename, "w"); 
fwrite($fp, $out, strlen($out)); 
fclose($fp); 
} 
} 
function openFile($path, $zipName) { 
$temp_path = $path; 
$temp_zip_path = $zipName; 
$zipDir = $zipName; 
if ($handle = @opendir($path)) { 
while (false !== ($file = readdir($handle))) { 
if($file !='.' and $file !='..'){ 
if(ereg('\.' , $file.@basename())) { 
$fd = fopen($path.'/'.$file, "r"); 
$fileValue = @fread ($fd, 1024000); 
fclose ($fd); 
$this -> addFile($fileValue, $zipName . '/' . $file); 
} else { 
$this ->openFile($path.'/'.$file, $zipName . '/' . $file); 
} 
} 
} 
$zipName = $temp_zip_path; 
$path = $temp_path; 
closedir($handle); 
} 
} 
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; 
$timearray['seconds'] = 0; 
} 
return (($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 = "\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); 
$c_len = strlen($zdata); 
$zdata = substr(substr($zdata, 0, strlen($zdata) - 4), 2); 
$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 = "\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 = $new_offset; 
$cdrec .= $name; 
$this -> ctrl_dir[] = $cdrec; 
} 
function filezip() { 
$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"; 
} 
} 
?>