I am a bit of newbie with CakePHP and DB-driven sites so bear with me.

I have an element that I am displaying on every page, and I am passing
one variable to it from every controller function.  If I do not pass
the variable I get an ugly unknown variable error.

I want to ease the requirement of passing the variable by not
displaying the relevant HTML from the element if the variable has not
been passed (avoiding the ugly unknown variable error).

Where would the logic for this go?  My best guess is the
AppController.  Second guess is creating a component for this. What's
the right thing to do?



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