[PHP-DB] Getting rows where column has changed?

[Leif K-Brooks]

I'm trying to make a page to help in detecting people using automatic refresher programs. In the table that stores user info, there is a column called "lastseen" which says when the user was last seen. I'm trying to:
1. Select all lastseen colmns that are less than 5 minutes old
2. Wait 2 seconds
3. Select lastseen columns that have changed since step 1, and display that info
Any ideas on how to do this? Is it even possible? Thanks...

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