The Hello, World tutorial covers the basic steps to start Resin and run a trivial php script in Quercus.

Adding PHP functions with a Java module.

JSON (JavaScript Object Notation) is a popular text data exchange format with built-in support from Quercus since Resin 3.0.20. One of the common uses of JSON in a PHP environment is for the server to send JSON data to the user's browser. Because the JSON language is a subset of JavaScript, JSON-encoded text can be readily parsed on the user's browser using JavaScript's eval() function.