Convert SS_Query results to JSON

queryToJSON.php

<?php

function queryToJSON(SS_Query $qry) {
	//the keys you want to code into JSON, this is to white list your array
  	$jsonKeys = array(
		'ID' => 'ID',
		'Title' => 'Title',
		'Content' => 'Content'
	);
	$dataToEncode = array();
	while ($record = $qry->next()) {
		$dataToEncode[$record['ID']] = array_intersect_key($record,$jsonKeys);
	}
	return Convert::array2json($dataToEncode);
}