Enterprise Web Services Framework for PHP
Apify is a small and powerful open source library that delivers new levels of developer productivity by simplifying the creation of RESTful architectures. Web services are a great way to extend your web application, however, adding a web API to an existing web application can be a tedious and time-consuming task. Apify takes certain common patterns found in most web services and abstracts them so that you can quickly write web APIs without having to write too much code.
Apify exposes similar APIs as the Zend Framework, so if you are familiar with the Zend Framework, then you already know how to use Apify. Take a look at the UsersController class.
You can see it in action here: http://www.youtube.com/watch?v=7ptoB0yCsDo