The user numbers are apparentely determined by including the 'userid' column from the database. Because of the fact that that column *always* increases - never fills in gaps with new records or the like - your userids could very well begin at 20, or 200, or 2,000. You'd need to use more than just $userinfo[userid] to get an accurate count - which potentially means more queries. (Oh, and you'd have to do this for each post in a thread - which could get somewhat resource-intensive.)
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