[RESOLVED] Tracking read/unread topics

[Quidam]

I'm looking for a way to keep track of what topics a user has read or not read in lets say a forum.
I can think of some ideas, but what is the best way?
Create a table with a row for each user and create an array of the topics he have read?
Or is there an easier/faster way?

Any help is appreciated.

[Mindzai]

I would probably create a table with 2 fields, topic_id and user_id, and query that to see if a topic is read.

[Quidam]

Would one of those fields have an array?
Or do you suggest one row for every topic each user has read? (Wouldn't that lead to thousands and thousands of rows?)

Thanks for the reply.