public function getBoundary()
    {
        if (null === $this->boundary) {
            $this->boundary = uniqid('', true);
        }

        return $this->boundary;
    }
public function getBoundary()
    {
        if (null === $this->boundary) {
            $this->boundary = uniqid('', true);
        }

        return $this->boundary;
    }
public function getBoundary ( ) { if ( null === $ this -> boundary ) { $ this -> boundary = uniqid ( '' , true ) ; } return $ this -> boundary ; }
Get the boundary that separates the streams.

@return string
Get the boundary that separates the streams .