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But in all his pages, this is constant, as in it never changes ever.
Although I recommended to the developer to store the variables elsewhere since it is always the same, or even place it in a session var or cookie, but he has something else in mind, I think he's just lazy to go into his code.
And since the web developer does not feel like fixing it from the top and is looking for a mod_rewrite solution to make:
Need help from mod_rewrite experts.