<?php

class BanIP
{

 const Interval = 0.8; 

 const Limit = 5;

 const Dir = '/ip_logs/';

 private static function getRoot() {

   return $_SERVER['DOCUMENT_ROOT'];

 }

 private static function getIp() {

   if (!empty($_SERVER['HTTP_CLIENT_IP'])) {

      return $_SERVER['HTTP_CLIENT_IP'];

  }

   elseif (!empty($_SERVER['HTTP_X_FORWARDED_FOR'])) {

      return $_SERVER['HTTP_X_FORWARDED_FOR'];

      }

   else {

      return $_SERVER['REMOTE_ADDR'];

      }
   } 

  private static function isIpLogs() {

   if(!is_dir(self::getRoot().self::Dir)) {

      mkdir(self::getRoot().self::Dir); 

      file_put_contents(self::getRoot().self::Dir.'.htaccess', 'deny from all');
    
    }
  
  return;

  }

  private static function isIpFile() {

   if (!file_exists(self::getRoot().self::Dir.self::getIp().'.dat'))

  file_put_contents(self::getRoot().self::Dir.self::getIp().'.dat', null);

  return;

  }

  static function unban($ip) {

  $file = file(self::getRoot().'/.htaccess');

  $ip_str = 'deny from ' . $ip;

  $str_file = implode($file);
 
  if (strstr($str_file, $ip_str)) {

    $del_ip = str_replace($ip_str, null, $str_file);

    file_put_contents(self::getRoot().'/.htaccess', $del_ip);

    echo 'IP розблокований';

   } else {

    echo 'Такий IP не заблокований';

  } 

  return;

  }

 static function setConnect($cVal = true) {

   echo self::isIpLogs();

   echo self::isIpFile();

  $lIP = file(self::getRoot().self::Dir.self::getIp().'.dat');

  $cIP = count($lIP);

  if($cIP >= self::Limit) {
  
  for ($i=0; $i<$cIP; ++$i) $cVal = $cVal && ($lIP[$i+1] - $lIP[$i]) < self::Interval;

  if ($cVal) {
  
  file_put_contents(self::getRoot().'/.htaccess', PHP_EOL.'deny from '.self::getIp().PHP_EOL, FILE_APPEND);

  unlink(self::getRoot().self::Dir.self::getIp().'.dat');

  exit('Ваш IP заблокований');

  }

  file_put_contents(self::getRoot().self::Dir.self::getIp().'.dat', null);

  }

  file_put_contents(self::getRoot().self::Dir.self::getIp().'.dat', microtime(true).PHP_EOL, FILE_APPEND);

  return;

}

}