On Sat, Jan 10, 2009 at 6:31 PM, Nathan Rixham <nrixham@xxxxxxxxx> wrote:
> Evening All,
>
> Not too often I ask a question here, but here goes;
>
> I'm making an "Object" class which all of my other classes extend, and I
> need each instance to have it's own unique id, seemed simple but it's harder
> than I thought (the difficulty is when it comes to deciding the syntax).
>
> so far each object has an OBJECT_ID which is a simple static incremented
> integer representing the instance of the object, here's a simplified
> example:
>
> abstract class Object {
>
> private static $INSTANCES = 0;
> private $OBJECT_ID = 0;
>
> public function __construct()
> {
> $this->OBJECT_ID = ++self::$INSTANCES;
> }
>
> }
>
> Now back to the problem, I also need the object to have
> private $UNIQUE_ID;
>
> this unique_id needs to have:
> timestamp
> classname
> object_id
>
> combining the three makes a unique id; but it's only unique to that session,
> no good for a real world application as there could be 50 sessions all
> running at the same time on the server; and odds are rather high that two
> instances of the object could have the same id. Thus an extra completely
> unique identified needs added to the three values above.
>
> I'd thought a simple random integer would possibly be enough (combined with
> the timestamp), but there could still be collission.
>
> so the best I've got so far is:
> [OBJECT_ID:private] => 3
> [UNIQUE_ID:private] => instance://1231629807@xxxxxxxxxxxx:97739
> timestamp @ class . instance : randomInteger
>
> all I need is a completely unique id for each object instance that can never
> be repeated at any time, even in a multiserver environment (and without
> using any kind of incremented value from a db table or third party app)
>
> thoughts, ideas, recommendations?
>
> regards!
>
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>
>
I was going to say uuid, but maybe SplObjectStorage might be of some help.
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