Problem with variables

[email protected] (Fernando A)
Newsgroups php.general
Message-ID <CALV+rTY-DdUu4cLGXM5eyXOA2tA83=hzcdAsaqjQ7zTQt1nbYg@mail.gmail.com> 
Hello,

I am working with php and codeigniter, but I have not yet experienced.
I need create a variable that is available throughout  system.
This variable contains the number of company and can change.
as I can handle this?

Thank you, very much!

Ferd
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