public function getStatusAsString()
    {
        $returnValue = (string) '';

        
        switch ($this->getStatus()){
            case self::INVALID:
                $returnValue = 'invalid';
            break;
            
            case self::UNKNOWN:
                $returnValue = 'unknown';
            break;
            
            case self::VALID:
                $returnValue = 'valid';
            break;
        }
        

        return (string) $returnValue;
    }