Website Defense DDoS PHP code

Today's theme is Web site attack and website protection. This is the information I have found that can effectively intercept my DDoS a PHP code

<?php
Query prohibits 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: ".) <br> "." Your IP address are forbided by some reason, IF you have any question Pls Emill to shop@mydalle.com! ");

Add Prohibit 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:".) <br> "." Sorry,you are forbided by refreshing frequently a much more, Pls wait for ". $timepass." Too to Seconds ");
}
}
}
}
if ($yesno) $str. = $checkip. $checkuri. $time. " 1\r\n ";
File_put_contents ($file, $STR);
?>