private function makeDestination($id, $width, $height)
    {
        return sprintf('%s/%s/%sx%s', $this->dir, $id, $width, $height);
    }
private function makeDestination($id, $width, $height)
    {
        return sprintf('%s/%s/%sx%s', $this->dir, $id, $width, $height);
    }
private function makeDestination ( $ id , $ width , $ height ) { return sprintf ( '%s/%s/%sx%s' , $ this -> dir , $ id , $ width , $ height ) ; }
Makes destination folder

@param string $id
@param string $width
@param string $height
@return string
Makes destination folder