下面是平时备份MYSQL数据库代码，现在想去掉压缩WINRAR这一环节（太花时间），删除5天前的.rar改为删除5天前的文件夹，本人不懂，有请高手帮忙修改一下代码，谢谢！
<?
/*/////////////////////////
#FileName: mysql_backup.php
#Author: faisun
#Website: http://www.XXX.com
////////////////////////*/
//保存目录,路径要用反斜杠.您需要手动建立它.
$store_folder = 'e:\databse_backup';
//用户名和密码
//该帐号须有操作的数据库及FILE的权限
//否则有些数据库不能备份.
$db_username = "root";
$db_password = "XXXXXXX";
$time=time();
$nowdir = "$store_folder\\".date("Ymd",$time)."";
if(file_exists("$nowdir.rar")) die("File exists.\r\n");
@mkdir($nowdir);
mysql_connect("localhost","$db_username","$db_password");
$query=mysql_list_dbs();
$command = '';
while($result=mysql_fetch_array($query)){
$command .= dirname(__FILE__).'\..\mysql\bin\mysqldump --default-character-set=gbk '."$result -u{$db_username} ".($db_password?"-p{$db_password}":"")." > $nowdir\\$result.sql \r\n";
$command .= "echo dumping database `$result`... \r\n";
}
$command .= "echo Winrar loading...\r\n";
$command .= dirname(__FILE__)."\\WinRAR\\WinRAR.exe a -ep1 -r -o+ -m5 -df \"$nowdir.rar\" \"$nowdir\" \r\n";
$command .= "echo OK!\r\n";
$command .= "del mysqldumping_temp.bat\r\n";
$fp = fopen('mysqldumping_temp.bat','w');
fwrite($fp,$command);
fclose($fp);
//删除 5 天前的文件
@unlink("$store_folder\\".date("Ymd",$time-86400*5).".rar");
?>
