Is there any PHP library that validates a JSON object against a JSON Schema?
About jsonschemaphpv, although it´s not very well maintained, we use it a lot and it works. It´s a port from the js validator. It has a full test suite that runs against the php and the http://code.google.com/p/jsonschema/.
And guess what... It passes on more tests than the js. At least at the last time I run the tests. The thing is that the project is not very well structured and looks ugly. But I ensure you it´s very stable. It also allows you to validate associative arrays as objects either.
I´ve written the tests in selenium first. After that I wrote them in phpunit. I´m not sure if the phpunit tests are there.
If you give it a try and really want to use it I can start a branch for it on github with the phpunit tests.
Bruno Reis (the person who ported the js to php)