So I succumbed to your requests... Here is a rough cut at a Jangle PHP library:
http://jangle.googlecode.com/svn/trunk/connectors/openbiblio/lib/jangle.php
It requires PHP5, but hopefully that's not a major issue. There's
still a lot to do with it, like, oh... documenting the code... but
it's a start.
In true eating your own dogfood fashion, the OpenBiblio connector is
now using this:
http://connector.jangle.org/resources/
Even though I have not implemented Conditional GETs in it yet, its
uncached performance is already nearly as fast as the Ruby based
connector serving 304s.
So I owe a debt of gratitude to Andrew and David.
-Ross.