小弟我有这么一个压缩文件夹的类，求更快的压缩方法

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");
			$fwrite = fwrite($fp, $out, strlen($out));
			fclose($fp);
			if($fwrite == true)
			{
				return true;
			}
		}
		return false;
	}

	function openFile($path, $zipName)
	{
		$temp_path		 = $path;
		$temp_zip_path	 = $zipName;
		$zipDir			 = $zipName;
		
		if($handle			 = @opendir($path))
		{
			while(($file = readdir($handle))!==false)
			{
				$sub_dir = $path . DIRECTORY_SEPARATOR . $file;    //构建子目录路径
				if($file == '.' || $file == '..') {
					continue;
				}else if(is_dir($sub_dir)) {    //如果是目录,进行递归
					$this->openFile($path . '/' . $file, $zipName . '/' . $file);
				}
				else{
					$fd			 = fopen($path . '/' . $file, "r");
					$fileValue	 = @fread($fd, 1024000);
					if($fd)
						fclose($fd);
					$this->addFile($fileValue, $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";
	}

}

//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。