At this time there are 2 diferent accounts, with both domain names getting each their very own hosting account,
for similar website (let us say domain.fr and domain.co.united kingdom)!
I have merged both websites into one (presently located as .../site/language ),
which makes it multilanguage! The script only need a prefix on root,
for example like world wide web.domain.com/british/ or world wide web.domain.com/french.

This works not surprisingly, if perhaps a website can be used, but I must use two diferent domain names (domain.fr / domain.co.united kingdom).

So, I wish to catch the present request URL, to be aware what language to show. What's important is the fact that, the request web addresses keep persistent.

For instance,

http://domain.co.united kingdom/language_british

http://domain.co.united kingdom/language_british/somepage.php

http://domain.co.united kingdom/language_british/somedirectory/someotherpage.php

While,

http://domain.fr/language_french

http://domain.fr/language_french/somepage.php

http://domain.fr/language_french/somedirectory/someotherpage.php

This two domain names are actuall located in same hosting account, let us stated

127...1/language_variable/somepage.php

Any sugestions or good practices ?

Basically got your question , It is a feature in Web Hosting's solution that is known as Addon Domain names and rely on webhost that the number of Addon Domain they allow you to to place into one account !