Switching contents language in CodeIgniter

[eluser]gon[/eluser]

1) In language files, should English and Arabic array keys be different from each other (e.g: $lang[’welcome_en’] and $lang[’welcome_ar’])? or are they supposed to use the same key name since they’re in different files?

Using CI language files, you generate 2 files with the same name, and store them in its folder:
arabic/mytranslations.php
english/mytranslations.php

Read the user guide for details on loading the correct file.

2) How do I use the ‘yourdomain.com/ar/home’ URI structure when home is my default controller? I don’t know how that would work with other controllers either.

Sometimes I extend the CI URI library to make it work the way I want. For example, store the first uri segment in the $language var, and consider the second segment to be the first, so controllers will load as usual.

But you can try using .htaccess rules, or CI routing.

Good luck