Internationalization and localization (i18n) for CodeIgniter 3.0?

I have written some notes here: http://forum.codeigniter.com/thread-77.html Also, one my application skeletons (CI3-based) supports partly the things you need: https://github.com/ivantcholakov/starter...-edition-4 , here is a demo: http://iridadesign.com/starter-public-edition-4/www/

To be honest about internationalization, with CodeIgniter you are on your own, you need to implement everything alone. Consider using a ready CodeIniter-based CMS, or have a look at Yii2 framework.

Not important:
http://example.com/en/products and http://example.com/fr/produits - this seems a better choice for me. Otherwise if a word (the slug) is the same in two languages - a collision happens, what content is to be shown then.