Integrating AJAX and PHP
The Zend Framework is integrated with Dojo Toolkit. I haven't used the latest Zend Framework yet, but I do know that in the past, it has proven to be reliable.
There might be one but I can't imagine why. An AJAX request looks and acts just like an HTTP request from the perspective of the server. You can get and set cookies. All the environment variables that you would expect from an HTTP request are there. All of the HTTP verbs work as do any of the header fields.