> 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. -- View this message in context: http://www.nabble.com/optimizing-space-for-array-of-booleans-tp22159131p22174206.html Sent from the PHP - General mailing list archive at Nabble.com. -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php