I've just put up version 1.4.3 of phpFlickr for you to download. The guys at Flickr just put out a new method to display the most interesting photos of a day. I've implemented it as interestingness_getList(). If you go to the interestingness example, you can see it in action. One thing to bear in mind is that the first date parameter must be in the YYYY-MM-DD format. I haven't built in any date conversions yet and that's the format that the API is expecting. I may build in some conversions for the next minor release.
Another important note: If you were using favorites_getList() or favorites_getPublicList(), you'll need to adjust your program slightly. Instead of being able to access the $result['photo'] array, you'll need to access $result['photos']['photo'] array. Why did I do this? The "photos" element holds more data than just the photos. You'll need that data to view how many favorites someone has, how many pages there are, etc. The first way I did it was a mistake and I hope that you'll find it in your collective heart to forgive me.