How to get timezone from airport code (IATA/FAA)

Question

I am trying to make a PHP function that returns the UTC timezone for a given airport code (IATA/FAA).

What the function should do is something like this:

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Answer 1

Seeing as the question is still open I'd like to point to my very own timezone map files. For your particular purpose, the IATA tzmap seems perfect:

https://raw.github.com/hroptatyr/dateutils/tzmaps/iata.tzmap

Obviously, you'd have to snarf the offset in question (it depends on a date as it might change over time) from the zoneinfo files, e.g. with zdump(1).