note, codeigniter routes with two value
its more fancy looked url
http://your.co/portfolio/portfolio-categories-nature/
http://your.co/portfolio/portfolio-categories-nature/pic-from-bromo-mountain
than this
http://your.co/portfolio/gallery/portfolio-categories-nature/
http://your.co/portfolio/detail/portfolio-categories-nature/pic-from-bromo-mountain
how you can doing this, if the controllers
and that is why you need route in codeigniter