public function getSerial()
    {
        if (empty($this->serial)) {
            $this->serial = sha1(serialize($this->getAll()));
        }
        return $this->serial;
    }
public function getSerial()
    {
        if (empty($this->serial)) {
            $this->serial = sha1(serialize($this->getAll()));
        }
        return $this->serial;
    }
public function getSerial ( ) { if ( empty ( $ this -> serial ) ) { $ this -> serial = sha1 ( serialize ( $ this -> getAll ( ) ) ) ; } return $ this -> serial ; }
Returns a SHA-1 signature for the entire configuration object
that uniquely identifies that particular configuration

@return string
Returns a SHA - 1 signature for the entire configuration object that uniquely identifies that particular configuration