哪位达人帮帮忙修改上现在的代码备份mysql的php代码要求备份到本地

DATE: ".date('Y-n-j H:i:s')."
ERROR: ".$info."
SQL: ".$sql."
}
"; 
} 
public function close(){ 
self::$DB =null; 
} 
public function __destruct() 
{ 
self::close(); 
} 
} 

/*---class end*/ 

function makedir($dirpath){ 
if(!$dirpath) return 0; 
$dirpath=str_replace("\\","/",$dirpath); $mdir=""; 
foreach(explode("/",$dirpath) as $val){ 
$mdir.=$val."/"; 
if($val==".."||$val==".")continue; 
if(!is_dir($mdir)&&!file_exists($mdir)){ 
if(!@mkdir($mdir,0755)){ 
exit("创建目录 [".$mdir."]失败."); 
} 
} 
} 
return true; 
} 

function delDirAndFile($dirName){ 
if($handle=opendir($dirName)){ 
while(false!==($item = readdir($handle))){ 
if($item !="."&&$item!=".."){ 
if(is_dir( "$dirName/$item")){ 
delDirAndFile( "$dirName/$item"); 
}else{ unlink("$dirName/$item"); } 
} 
} 
closedir( $handle ); 
if( rmdir( $dirName ) )echo "成功删除目录： $dirName
\n"; 
} 
} 

function filein($filename="databak/",$table='',$mysql=''){ 
$fp = fopen($filename.'/'.$table.'.sql','w'); 
fputs($fp,$mysql); 
fclose($fp); 
} 

header("Content-Type:text/html;charset=utf-8"); 

$db=new dbmysql(); 

$table=$db->getTablesName(); 

$filename="databak/".date("Ymd"); 
$url=getcwd()."/databak/"; 
$handle = opendir($url); 
while(false!==($file = readdir($handle))){ 
if ($file!="."&&$file!=".."&&is_dir($url."/".$file)) { 
if(date("Ymd")-$file>5){delDirAndFile($url."/".$file);}; 
} 
} 

makedir($filename); 
foreach($table as $t){ 
$s1=$db->fetch_array("show create table `$t`"); 
$mysql="/*Time:".date("Y-m-d H:i:s")." */\r\nDROP TABLE IF EXISTS `$t`;\r\n".$s1['Create Table'].";\r\n\r\n"; 
$a1=$db->fetch_assoc("select * from `$t`"); 
foreach ($a1 as $data){ 
$vals=array_values($data); 
$vals=array_map('addslashes',$vals); 
$vals=join("','",$vals); 
$vals="'".$vals."'"; 
$mysql.="INSERT INTO `$t` VALUES ($vals);\r\n"; 
} 
$mysql.="\r\n"; 
filein($filename,$t,$mysql); 
} 

echo "数据备份成功,生成备份文件 　　".getcwd()."/".$filename."/
程序自动清理5天以前的备份"; 
?>