On Mon, May 16, 2005 12:09 pm, Evert | Rooftop said: > $id1 $id2 and $id3 are when they are combined unique > > * Is there a chance of collision when MD5 is used on the id's and the > ids are long strings Yes. I think it's like 1 in 2 billion odds. If you can concatenate $id1$id2$id3 and get a guaranteed unique string, why not just use that as your unique string? There are, of course, several good reasons NOT do, which may or may not apply to your case: Exposing the id's would be a security flaw. Concatenating all three id's isn't really unique, after all. (EG all three are integer IDs from MySQL.) The concatenation of all three is WAY too long. > * Is serialize the fastest way to serialize ;) ? Probably, but not serializing at all, and stuffing the data directly into shared memory would perhaps be faster, at least as I vaguely understood the results of a thread on serialization on this very forum from a month or two ago. (Check archives for "serialize" "shared memory" and "Rasmus Lerdorf" who weighed in with a succinct explanation of how to avoid serialization if that performance hit was really a problem (unlikely as that was)) -- Like Music? http://l-i-e.com/artists.htm -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
