Pull your data from MySQL using whatever tools you like (I prefer PDO, but to each his own) and put it in an array (if it isn't fetched that way already). The simplest way to encode your data in JSON is to use the json_encode function (http://se.php.net/manual/en/function.json-encode.php), which takes an array and outputs a JSON string representation of the array. Non-associative arrays are output as JSON arrays; associative arrays are output as JSON object maps (see examples on the PHP json_encode page). json_encode is included in PHP 5.2+ and is available as a module for older PHP versions.
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