public function extension($sExtension = null)
    {
        if (null === $sExtension) {
            return $this->getExtension();
        }

        return $this->setExtension($sExtension);
    }
public function extension($sExtension = null)
    {
        if (null === $sExtension) {
            return $this->getExtension();
        }

        return $this->setExtension($sExtension);
    }
public function extension ( $ sExtension = null ) { if ( null === $ sExtension ) { return $ this -> getExtension ( ) ; } return $ this -> setExtension ( $ sExtension ) ; }
Get or set the avatar extension to use.

@param string $sExtension The avatar extension to use.
@return string|\forxer\Gravatar\Image
Get or set the avatar extension to use .