If Phlickr isn’t right for you (too complex, can’t use PHP5) check out some of these other PHP API Kits:
PEAR::Flickr_API module - The closest thing to an “official” release as you’ll find. It’s PHP4 compatible. You’ve got to roll your own requests and parse the responses.
phpFlickr - A wrapper to the PEAR module. Might make development easier but it has some
code smells about it. I’d really like to see it refactored into several classes.
Oberkampf - A cut-and-paste solution. If it does what you want, it’ll do it out of the box.