PHP, JSON and JavaScript Usage
http://ditio.net/2008/07/17/php-json-and-javascript-usage/

Ditio
2008

Abstract:

Today i want to introduce you to jSON (JavaScript Object Notation), in short, it is a simple format designed to exchange data between different programming languages. I will show you how to create JavaScript object, convert it to JSON string, and send to PHP script, which will decode jSON string to readable format (for PHP). But that’s not all, PHP script will create it’s own data object encode it to jSON string and send it back. All communication between JavaScript and PHP will be done thru AJAX.