网站被攻击php防止办法

最近网站经常被攻击，后来想到了一个利用php来防止网站受攻击的办法，下面是我的代码，代码不是最好的，根据自己的需求来做，下面来看看我的代码。

最近网站经常被攻击，后来想到了一个利用php教程来防止网站受攻击的办法，下面是我的代码，代码不是最好的，根据自己的需求来做，下面来看看我的代码。
/*
*网站防ip攻击代码(anti-ip attack code website)2010-11-20,ver2.0
*mydalle.com anti-refresh mechanism
*design by www.bKjia.c0m
*/

//查询禁止ip
$ip =$_server['remote_addr'];
$fileht=".htaccess2";
if(!file_exists($fileht))file_put_contents($fileht,"");
$filehtarr=@file($fileht);
if(in_array($ip."rn",$filehtarr))die("warning:"."
"."your ip address are forbided by mydalle.com anti-refresh mechanism, if you have any question pls emill to [e-mail]!
(mydalle.com anti-refresh mechanism is to enable users to have a good shipping services, but there maybe some inevitable network problems in your ip address, so that you can mail to us to solve.)");

//加入禁止ip
$time=time();
$fileforbid="log/forbidchk.dat";
if(file_exists($fileforbid))
{ if($time-filemtime($fileforbid)>30)unlink($fileforbid);
else{
$fileforbidarr=@file($fileforbid);
if($ip==substr($fileforbidarr[0],0,strlen($ip)))
{
if($time-substr($fileforbidarr[1],0,strlen($time))>120)unlink($fileforbid);
elseif($fileforbidarr[2]>120){file_put_contents($fileht,$ip."rn",file_append);unlink($fileforbid);}
else{$fileforbidarr[2]++;file_put_contents($fileforbid,$fileforbidarr);}
}
}
}
//防刷新
$str="";
$file="log/ipdate.dat";
if(!file_exists("log")&&!is_dir("log"))mkdir("log",0777);
if(!file_exists($file))file_put_contents($file,"");
$allowtime = 60;//防刷新时间
$allownum=5;//防刷新次数
$uri=$_server['request_uri'];
$checkip=md5($ip);
$checkuri=md5($uri);
$yesno=true;
$ipdate=@file($file);
foreach($ipdate as $k=>$v)
{ $iptem=substr($v,0,32);
$uritem=substr($v,32,32);
$timetem=substr($v,64,10);
$numtem=substr($v,74);
if($time-$timetem if($iptem!=$checkip)$str.=$v;
else{
$yesno=false;
if($uritem!=$checkuri)$str.=$iptem.$checkuri.$time."1rn";
elseif($numtem else
{
if(!file_exists($fileforbid)){$addforbidarr=array($ip."rn",time()."rn",1);file_put_contents($fileforbid,$addforbidarr);}
file_put_contents("log/forbided_ip.log",$ip."--".date("y-m-d h:i:s",time())."--".$uri."rn",file_append);
$timepass=$timetem+$allowtime-$time;
die("warning:"."
"."pls don't refresh too frequently, and wait for ".$timepass." seconds to continue, if not your ip address will be forbided automatic by mydalle.com anti-refresh mechanism!
(mydalle.com anti-refresh mechanism is to enable users to have a good shipping services, but there maybe some inevitable network problems in your ip address, so that you can mail to us to solve.)");
}
}
}
}
if($yesno) $str.=$checkip.$checkuri.$time."1rn";
file_put_contents($file,$str);
?>