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😃 😃
On a more serious note....
This could be done any number of ways, if I am understanding your question correctly.
You want a certain user (whomever it may be) to see a "demo" version of a site, with different characteristics than another user (whomever that might be) who sees the "regular" version.
I'd use sessions, and put the variables in some external config file. When the user first comes to the site, check if he should be shown the "demo" site. If so, assign a variable in the session array, and include the external file. Then, on each successive page, check for the session variable and include the file.
HTH,