Re: Unique Object Instance ID..?

Unique()? Bastien Sent from my iPod On 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