Можно ли обойти этот фильтр?

PHP:

public function GetUserIp(){
    
        if($this->UserIP == "Undefined"){
            
            if(isset($_SERVER['HTTP_X_FORWARDED_FOR']) AND !empty($_SERVER['HTTP_X_FORWARDED_FOR']))
               {
                
            $client_ip = ( !empty($_SERVER['REMOTE_ADDR']) ) ? $_SERVER['REMOTE_ADDR'] : ( ( !empty($_ENV['REMOTE_ADDR']) ) ? $_ENV['REMOTE_ADDR'] : "unknown" );
              $entries = split('[, ]', $_SERVER['HTTP_X_FORWARDED_FOR']);

              reset($entries);
                
                while (list(, $entry) = each($entries))
                {
                $entry = trim($entry);
                    if ( preg_match("/^([0-9]+\.[0-9]+\.[0-9]+\.[0-9]+)/", $entry, $ip_list) )
                     {
                    
                    $private_ip = array(
                          '/^0\./',
                          '/^127\.0\.0\.1/',
                          '/^192\.168\..*/',
                          '/^172\.((1[6-9])|(2[0-9])|(3[0-1]))\..*/',
                          '/^10\..*/');
        
                        $found_ip = preg_replace($private_ip, $client_ip, $ip_list[1]);
        
                        if ($client_ip != $found_ip)
                        {
                           $client_ip = $found_ip;
                           break;
                        }
                        
                    }
                    
                }
            
            $this->UserIP = $client_ip;
            return $client_ip;
            
            }else return ( !empty($_SERVER['REMOTE_ADDR']) ) ? $_SERVER['REMOTE_ADDR'] : ( ( !empty($_ENV['REMOTE_ADDR']) ) ? $_ENV['REMOTE_ADDR'] : "unknown" );
        
        }else return $this->UserIP;
    
    }