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Такая подобная штука я понял есть в incfiles/classes/core.php

/*
    -----------------------------------------------------------------
    Проверка адреса IP на флуд
    -----------------------------------------------------------------
    */
    private function ip_flood()
    {
        if ($this->flood_chk) {
            //if ($this->ip_whitelist(self::$ip))
            //    return true;
            $file = ROOTPATH . 'files/cache/ip_flood.dat';
            $tmp = array();
            $requests = 1;
            if (!file_exists($file)) $in = fopen($file, "w+");
            else $in = fopen($file, "r+");
            flock($in, LOCK_EX) or die("Cannot flock ANTIFLOOD file.");
            $now = time();
            while ($block = fread($in, 8)) {
                $arr = unpack("Lip/Ltime", $block);
                if (($now - $arr['time']) > $this->flood_interval) continue;
                if ($arr['ip'] == self::$ip) $requests++;
                $tmp[] = $arr;
                self::$ip_count[] = $arr['ip'];
            }
            fseek($in, 0);
            ftruncate($in, 0);
            for ($i = 0; $i < count($tmp); $i++) fwrite($in, pack('LL', $tmp[$i]['ip'], $tmp[$i]['time']));
            fwrite($in, pack('LL', self::$ip, $now));
            fclose($in);
            if ($requests > $this->flood_limit){
                die('FLOOD: exceeded limit of allowed requests');
            }
        }
    }