Re: Unique Object Instance ID..?

On Sat, Jan 10, 2009 at 6:31 PM, Nathan Rixham <nrixham@gmail.com> 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@TestObject.3:97739 > 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! > > -- > PHP General Mailing List (http://www.php.net/) > To unsubscribe, visit: http://www.php.net/unsub.php > > I was going to say uuid, but maybe SplObjectStorage might be of some help.