Multilanguage constant files and inclusion

[eluser]vigna[/eluser]
Hi ALL,
I am working on a Multilanguage website using CodeIgniter and I am NEW to it.
I had defined Language based constants in three files en.php for english etc..

What is the best/correct way to put the files and include them:
1. Where should I place these files (language constant files)
2. Where/How should I include them.

Actually the language is passed thru the URL and based the value
for e.g www.domain-name.com/contact_us/en
I have to include the language file depending on the last value

Thank you very much!

[eluser]xwero[/eluser]
Why not work with the CI language library?

You shouldn't work with constants because they are inflexible. if your language string has a placeholder you have to assign the constant to a variable before you can replace the placeholder with the actual content.

[eluser]vigna[/eluser]
Oh! I see. I will check it out.
Thank you very much!