What is n in a hook function?

[Jeffrey Walton <noloader@xxxxxxxxx>]

Hi Everyone,

I'm reading https://httpd.apache.org/docs/2.4/developer/hooks.html. It
says to declare a hook function:

    AP_DECLARE_HOOK(int, do_something, (request_rec *r, int n))

But it does not explain the parameters. I know what request_rec is,
but I don't know what n is.

What is n in the hook function?

Thanks in advance.

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