Analysis of the solution of PHP program to prevent Ddos,dns and Cluster Server attack _php tutorial

Nonsense not much to say on the code
Copy CodeThe code is as follows:
//Query prohibit IP
$ip =$_server[' remote_addr '];
$fileht = ". Htaccess2";
if (!file_exists ($fileht))
File_put_contents ($fileht, "");
$filehtarr = @file ($fileht);
if (In_array ($ip. " \ r \ n ", $filehtarr))
Die ("Warning:". ")
"." Your IP address is forbided by some reason and IF you had any question Pls Emill to shop@mydalle.com! ");
//Join Forbidden IP
$time =time ();
$fileforbid = "Log/forbidchk.dat";
if (file_exists ($fileforbid)) {
if ($time-filemtime ($fileforbid) >60)
Unlink ($fileforbid);
else {
$fileforbidarr = @file ($fileforbid);
if ($ip ==substr ($fileforbidarr [0],0,strlen ($IP))) {
if ($time-substr ($fileforbidarr [1],0,strlen ($time)) >600)
Unlink ($fileforbid);
ElseIf ($fileforbidarr [2]>600) {
File_put_contents ($fileht, $ip. " \ r \ n ", file_append);
Unlink ($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 = 120;//anti-refresh Time
$allowNum =10;//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. $time. " 1\r\n ";
ElseIf ($numtem < $allowNum)
$str. = $iptem. $uritem. $timetem. ($numtem + 1). " \ r \ n ";
else {
if (!file_exists ($fileforbid)) {
$addforbidarr =array ($ip. " \ r \ n ", Time ()." \ r \ n ", 1);
File_put_contents ($fileforbid, $addforbidarr);
}
File_put_contents ("Log/forbided_ip.log", $ip. " --". Date (" Y-m-d h:i:s ", Time ())." --". $uri." \ r \ n ", file_append);
$timepass = $timetem + $allowTime-$time;
Die ("Warning:". ")
"." Sorry,you is forbided by refreshing frequently too much, Pls wait for ". $timepass." Seconds to continue! ");
}
}
}
}
if ($yesno) $str. = $checkip. $checkuri. $time. " 1\r\n ";
File_put_contents ($file, $STR);
?>

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