Site İçi Flood Engelleme

<?php

$a = (int)date("i");
      $ip = $_SERVER['REMOTE_ADDR']; 
      $exec = mysql_query("insert into tbllog(ip,tarih) values('$ip','$a')");
      $z = $a-1;
      $q = mysql_query("select * from tbllog where ip='$ip' and tarih >='$z'");
      if(mysql_num_rows($q)>=40)
      {
         $ban = mysql_query("insert into tblbanlist(ip) values('$ip')");
         if($ban)
         {
            header('Location: ban.html');
         }
      }
      $q2 = mysql_query("select * from tblbanlist where ip='$ip'");
      if(mysql_num_rows($q2)>=2)
      {
            header('Location: ban.html');
      }
         
      $settime = "00:00";
      $gettime = date("h:i");
      if($gettime==$settime)
      {
         $trunlog = mysql_query("truncate table tbllog");
         if($trun)
         {
            header('Location: bakim.html');
         }
      }
      $setday = "15";
      $a = date("d");
         if($setday==$a)
         {
            $trunban = mysql_query("truncate table tblbanlist");
            if($trunban)
            {
               header('Location: bakim.html');
            }
         }
?>

CREATE TABLE `tblbanlist` (
  `id` int(11) NOT NULL auto_increment,
  `ip` varchar(50) collate utf8_turkish_ci NOT NULL,
  PRIMARY KEY  (`id`)
) ENGINE=MyISAM  DEFAULT CHARSET=utf8 COLLATE=utf8_turkish_ci AUTO_INCREMENT=5 ;
CREATE TABLE `tbllog` (
  `id` int(11) NOT NULL auto_increment,
  `ip` varchar(50) collate utf8_turkish_ci NOT NULL,
  `tarih` varchar(50) collate utf8_turkish_ci NOT NULL,
  PRIMARY KEY  (`id`)
) ENGINE=MyISAM  DEFAULT CHARSET=utf8 COLLATE=utf8_turkish_ci AUTO_INCREMENT=80 ;