> you should not worry about optimizing boolean values unless you would store
them in database.
I DO need to store them in a database, that's why I'm asking. I won't care
if I only use PHP, since it won't keep my data in memory for a long time.

> anyways, use bitwise operators
I think I've stated that I don't want to use bitwise operations. It's OK for
small sets, but not for a set with about 200 elements. Anyway, I found
bitset library in PECL, but I found no documentation at all.
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