I can explain it for you.
What you'll need is a new table in your database with a couple fields. 1 for an IP, 1 for the theme name and 1 for the date. Then you'll want the coding to detect if someone is a guest and if they are insert a new entry into the table with the information. Simple as that. You'll also want a cron job to run weekly and erase entries over 1-2 weeks old depending on how many guests you get per day.
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