OOP: Souborový banovací systém - sám se vyprazdňuje

class Banlist{
  public  $someUBs;
  private $loaded,
          $banlist,
          $filepath,
          $ban_count,
          $bLog;
  
  public function __construct($fpath){
    if(empty($fpath)) throw new Exception("Path for banlist file is required!");
    $this->filepath = $fpath;
    $this->loaded = false;
    $logpath = substr($fpath,0,-4).".log";
    $this->bLog = new Log($logpath);
    $this->load();
  }

  public function load(){
    if(!file_exists($this->filepath)){
      @fclose(@fopen($this->filepath,"wb"));
      if(!file_exists($this->filepath)) throw new Exception("Banlist::load: Banlist file not exists!");
    }
    $this->banlist = Array();
    if($this->loaded === false){
      $this->loaded = true;
      $fsize = filesize($this->filepath);
      if($fsize){
        $fp = fopen($this->filepath, "rb");
        if($fp !== false){
          $bytes_readed = 0;
          while($bytes_readed < $fsize){
            //IP
            $ip = Array();
            $data = unpack("C",fread($fp,1)); //1. byte
            $ip[] = $data[1];
            $data = unpack("C",fread($fp,1)); //...
            $ip[] = $data[1];
            $data = unpack("C",fread($fp,1)); //...
            $ip[] = $data[1];
            $data = unpack("C",fread($fp,1)); //4. byte
            $ip[] = $data[1];
            $ip = implode(".",$ip);
            
            //Banned - timestamp
            $bantime = 0;
            $data = unpack("l",fread($fp,4));
            $bantime = $data[1];
            
            //Ban length
            $banlen = 0;
            $data = unpack("l",fread($fp,4));
            $bytes_readed += 12;
            $banlen = $data[1];
            $this->banlist[] = Array("ip"=>$ip,"banTime"=>$bantime,"banLen"=>$banlen);
          }
          fclose($fp);
        }
        else throw new Exception("Banlist::load: Can't open the banlist file for reading.");
      }
      $this->ban_count = count($this->banlist);
    }
  }
  
  public function ban($ip,$len=-1){
    if($this->loaded === false) throw new Exception("Banlist::ban: Banlist is not loaded!");
    if($len>=-1){
      $this->bLog->write("IP $ip was banned from {$_SERVER['REMOTE_ADDR']}. Length: ".($len == -1 ? "Permanently" : "$len seconds"));
      array_push($this->banlist,Array("ip"=>$ip,"banTime"=>time(),"banLen"=>$len));
      $this->ban_count++;
      return true;
    }
    return false;
  }

  public function unban($ip=false,$expired=false){
    if($this->loaded === false) throw new Exception("Banlist::unban: Banlist is not loaded!");
    if($ip !== false){
      $banlist = Array();
      foreach($this->banlist as $row){
        $found = array_search($ip,$row);
        if($found === false) array_push($banlist,$row);
        else{
          $this->ban_count--;
          $this->someUBs++;
          if($row['banLen'] != -1 && $row['banTime']+$row['banLen'] < time()) $expired = true;
          if(!$expired) $this->bLog->write("IP $ip was unbanned.");
          else $this->bLog->write("IP $ip was unbanned due to expiration of the ban length (expired ".Date("d.m.Y H:i:s",$row['banTime']+$row['banLen']).").");
        }
      }
      $this->banlist = $banlist;
    }
  }

  public function get(){
    if($this->loaded === false) throw new Exception("Banlist::get: Banlist is not loaded!");
    return $this->banlist;
  }

  public function isBannedIP($ip=false){
    if($this->loaded === false) throw new Exception("Banlist::isBannedIP: Banlist is not loaded!");
    if($ip !== false){
      foreach($this->banlist as $row){
        $found = array_search($ip,$row);
        if($found !== false){
          if($row['banLen']>=-1){
            if($row['banLen'] == -1) return $row;
            if(time() > $row['banTime']+$row['banLen']) $this->unban($ip,true);
            else return $row;
          }
        }
      }
    }
    return false;
  }

  public function save(){
    if($this->loaded === false) throw new Exception("Banlist::save: Banlist not loaded!");
    $fp = fopen($this->filepath."_tmp", "wb");
    if($fp !== false){
      if(@flock($fp, LOCK_EX)){
        foreach($this->banlist as $row){
          if(!empty($row) && is_array($row)){
            $partIp = explode(".",$row['ip'],4);
            $ip = pack("c",$partIp[0]).pack("c",$partIp[1]).pack("c",$partIp[2]).pack("c",$partIp[3]);
            fwrite($fp,$ip.pack("L",$row['banTime']).pack("L",$row['banLen']));
          }
        }
        flock($fp, LOCK_UN);
      }
      fclose($fp);
      if(@unlink($this->filepath) !== false){
        if(@rename($this->filepath."_tmp", $this->filepath) === false) throw new Exception("Banlist::save: Can't rewrite the banlist file (rename).");
        chmod($this->filepath, 0775);
      }
      else throw new Exception("Banlist::save: Can't rewrite the banlist file (delete).");
    }
    else throw new Exception("Banlist::save: Can't create a temporary banlist file.");
  }

  public function quantity(){
    return $this->ban_count;
  }

  public function __destruct(){
    unset($this->loaded);
    unset($this->banlist);
    unset($this->filepath);
    unset($this->ban_count);
  }
}

  public function save(){
    if($this->loaded === false) throw new Exception("Banlist::save: Banlist not loaded!");
    $fp = fopen($this->filepath, "r+");
    if($fp !== false){
      $locked = false;
      while(!$locked){
        if(@flock($fp,LOCK_EX)) $locked = true;
        else usleep(10000);
      }
      fseek($fp,0,SEEK_END);
      $flen = ftell($fp);
      rewind($fp);
      ftruncate($fp,$flen);
      foreach($this->banlist as $row){
        if(!empty($row) && is_array($row)){
          $partIp = explode(".",$row['ip'],4);
          $ip = pack("c",$partIp[0]).pack("c",$partIp[1]).pack("c",$partIp[2]).pack("c",$partIp[3]);
          fwrite($fp,$ip.pack("L",$row['banTime']).pack("l",$row['banLen']));
        }
      }
      flock($fp, LOCK_UN);
      fclose($fp);
    }
    else throw new Exception("Banlist::save: Can't open the file for writing.");
  }