[PHP] Unique Object Instance ID..?
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://1231629...@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!
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Re: [PHP] Unique Object Instance ID..?
On Sat, Jan 10, 2009 at 6:31 PM, Nathan Rixham nrix...@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://1231629...@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.
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Re: [PHP] Unique Object Instance ID..?
Unique()?
Bastien
Sent from my iPod
On Jan 10, 2009, at 6:31 PM, Nathan Rixham nrix...@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://1231629...@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
--
PHP General Mailing List (http://www.php.net/)
To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP] Unique Object Instance ID..?
On Sat, Jan 10, 2009 at 4:31 PM, Nathan Rixham nrix...@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). checkout spl_object_hash() http://php.net/function.spl_object_hash -nathan
Re: [PHP] Unique Object Instance ID..?
On Sat, 10 Jan 2009 18:42:01 -0700, Nathan Nobbe wrote: checkout spl_object_hash() http://php.net/function.spl_object_hash NB: only guarantees uniqueness for objects instantiated and in memory at the same time. See the comments on that page for an example of creating identical object hashes for two separate and distinct instances. -- Ross McKay, Toronto, NSW Australia Let the laddie play wi the knife - he'll learn - The Wee Book of Calvin -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
