小弟我有这么一个压缩文件夹的类，求更快的压缩方法

我有这么一个压缩文件夹的类，求更快的压缩方法

<br /><?php<br /><br />class PHPZip<br />{<br /><br />	var $datasec		 = array();<br />	var $ctrl_dir		 = array();<br />	var $eof_ctrl_dir	 = "\x50\x4b\x05\x06\x00\x00\x00\x00";<br />	var $old_offset		 = 0;<br />	<br />	function Zip($dir, $zipfilename)<br />	{<br />		if(@function_exists('gzcompress'))<br />		{<br />			@set_time_limit("0");<br />			$this->openFile($dir, $dir);<br />			$out = $this->filezip();<br />			$fp	 = fopen($zipfilename, "w");<br />			$fwrite = fwrite($fp, $out, strlen($out));<br />			fclose($fp);<br />			if($fwrite == true)<br />			{<br />				return true;<br />			}<br />		}<br />		return false;<br />	}<br /><br />	function openFile($path, $zipName)<br />	{<br />		$temp_path		 = $path;<br />		$temp_zip_path	 = $zipName;<br />		$zipDir			 = $zipName;<br />		<br />		if($handle			 = @opendir($path))<br />		{<br />			while(($file = readdir($handle))!==false)<br />			{<br />				$sub_dir = $path . DIRECTORY_SEPARATOR . $file;    //构建子目录路径<br />				if($file == '.' || $file == '..') {<br />					continue;<br />				}else if(is_dir($sub_dir)) {    //如果是目录,进行递归<br />					$this->openFile($path . '/' . $file, $zipName . '/' . $file);<br />				}<br />				else{<br />					$fd			 = fopen($path . '/' . $file, "r");<br />					$fileValue	 = @fread($fd, 1024000);<br />					if($fd)<br />						fclose($fd);<br />					$this->addFile($fileValue, $zipName . '/' . $file);<br />				}<br />			}<br />			$zipName = $temp_zip_path;<br />			$path	 = $temp_path;<br />			closedir($handle);<br />		}<br />	}<br /><br />	function unix2DosTime($unixtime = 0)<br />	{<br />		$timearray = ($unixtime==0) ? getdate() : getdate($unixtime);<br />		if($timearray['year']<1980)<br />		{<br />			$timearray['year']		 = 1980;<br />			$timearray['mon']		 = 1;<br />			$timearray['mday']		 = 1;<br />			$timearray['hours']		 = 0;<br />			$timearray['minutes']	 = 0;<br />			$timearray['seconds']	 = 0;<br />		}<br />		return (($timearray['year']-1980)<<25)|($timearray['mon']<<21)|($timearray['mday']<<16)|<br />				($timearray['hours']<<11)|($timearray['minutes']<<5)|($timearray['seconds']>>1);<br />	}<br /><br />	function addFile($data, $name, $time = 0)<br />	{<br />		$name				 = str_replace('\\', '/', $name);<br />		$dtime				 = dechex($this->unix2DosTime($time));<br />		$hexdtime			 = '\x' . $dtime[6] . $dtime[7]<br />				. '\x' . $dtime[4] . $dtime[5]<br />				. '\x' . $dtime[2] . $dtime[3]<br />				. '\x' . $dtime[0] . $dtime[1];<br />		eval('$hexdtime = "' . $hexdtime . '";');<br />		$fr					 = "\x50\x4b\x03\x04";<br />		$fr .= "\x14\x00";<br />		$fr .= "\x00\x00";<br />		$fr .= "\x08\x00";<br />		$fr .= $hexdtime;<br />		$unc_len			 = strlen($data);<br />		$crc				 = crc32($data);<br />		$zdata				 = gzcompress($data);<br />		$c_len				 = strlen($zdata);<br />		$zdata				 = substr(substr($zdata, 0, strlen($zdata)-4), 2);<br />		$fr .= pack('V', $crc);<br />		$fr .= pack('V', $c_len);<br />		$fr .= pack('V', $unc_len);<br />		$fr .= pack('v', strlen($name));<br />		$fr .= pack('v', 0);<br />		$fr .= $name;<br />		$fr .= $zdata;<br />		$fr .= pack('V', $crc);<br />		$fr .= pack('V', $c_len);<br />		$fr .= pack('V', $unc_len);<br />		$this->datasec[]	 = $fr;<br />		$new_offset			 = strlen(implode('', $this->datasec));<br />		$cdrec				 = "\x50\x4b\x01\x02";<br />		$cdrec .= "\x00\x00";<br />		$cdrec .= "\x14\x00";<br />		$cdrec .= "\x00\x00";<br />		$cdrec .= "\x08\x00";<br />		$cdrec .= $hexdtime;<br />		$cdrec .= pack('V', $crc);<br />		$cdrec .= pack('V', $c_len);<br />		$cdrec .= pack('V', $unc_len);<br />		$cdrec .= pack('v', strlen($name));<br />		$cdrec .= pack('v', 0);<br />		$cdrec .= pack('v', 0);<br />		$cdrec .= pack('v', 0);<br />		$cdrec .= pack('v', 0);<br />		$cdrec .= pack('V', 32);<br />		$cdrec .= pack('V', $this->old_offset);<br />		$this->old_offset	 = $new_offset;<br />		$cdrec .= $name;<br />		$this->ctrl_dir[]	 = $cdrec;<br />	}<br /><br />	function filezip()<br />	{<br />		$data	 = implode('', $this->datasec);<br />		$ctrldir = implode('', $this->ctrl_dir);<br />		return<br />				$data .<br />				$ctrldir .<br />				$this->eof_ctrl_dir .<br />				pack('v', sizeof($this->ctrl_dir)) .<br />				pack('v', sizeof($this->ctrl_dir)) .<br />				pack('V', strlen($ctrldir)) .<br />				pack('V', strlen($data)) .<br />				"\x00\x00";<br />	}<br /><br />}<br /><br />//我有个文件夹，大概30M，600个文件，打包时间超过半个小时候以上，谁有更好更快的打包方法啊，不胜感谢了。<br /><br />

------解决方案--------------------
php 提供有 zip 扩展，为什么不用？