PHP methods to prevent website being attacked_PHP tutorial

Recently, the website has been frequently attacked. Then I thought of a way to use php to prevent the website from being attacked. The following is my code. The code is not the best. You can do it according to your own needs. Let’s take a look at my code.

Recently, the website has been frequently attacked. Then I thought of a way to use PHP tutorials to prevent the website from being attacked. The following is my code. The code is not the best. You can do it according to your own needs. Let’s take a look at my code. .
/*
*Website anti-ip attack code (anti-ip attack code website)2010-11-20, ver2.0
*mydalle.com anti-refresh mechanism
*design by www.bKjia.c0m
*/

//Query banned 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 shop@mydalle.com!
(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.)");

//Add banned 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);}
}
}
}
//Anti-refresh
$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;//Anti-refresh time
$allownum=5;//Number of anti-refresh times
$uri=$_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<$allowtime){
if($iptem!=$checkip)$str.=$v;
else{
$yesno=false;
if($uritem!=$checkuri)$str.=$iptem.$checkuri.$time."1rn";
elseif($numtem<$allownum)$str.=$iptem.$uritem.$timetem.($numtem+1)."rn";
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 ".$timepass." seconds to continue, if not your ip address will be forbided automatically by mydalle.com anti -refresh mechanism!
(mydalle.com anti-refresh mechanism is to enable users to have a good shipping services, but there maybe some inevitable network problems in your ip address, so that you can mail to us to solve.) ");
}
}
}
}
if($yesno) $str.=$checkip.$checkuri.$time."1rn";
file_put_contents($file,$str);
?>