for more extendability for large scale apps use oop style with encapsulated fields.
Simple way :-
class Fruit implements JsonSerializable {
private $type = 'Apple', $lastEaten = null;
public function __construct() {
$this->lastEaten = new DateTime();
}
public function jsonSerialize() {
return [
'category' => $this->type,
'EatenTime' => $this->lastEaten->format(DateTime::ISO8601)
];
}
}
echo json_encode(new Fruit()); //which outputs:
{"category":"Apple","EatenTime":"2013-01-31T11:17:07-0500"}
Real Gson on PHP :-