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Re: out of sheer curiosity... [message #177592 is a reply to message #177579]

Tue, 10 April 2012 16:15

Thomas Mlynarczyk
Messages: 131
Registered: September 2010

Karma:

Senior Member

Jerry Stuckle schrieb:

> If you are considering __wakeup() to be a constructor, then __sleep(),
> being exactly the opposite, would be a destructor. (why do you think
> they are called "sleep" and "wakeup" if the designers didn't consider
> them to be opposites?).

They are opposites with respect to the process of serialization and may
be thought of as "to-do-before" and "to-do-after". And __sleep() is not
the exact opposite of __wakeup() -- the object is still awake after
__sleep() has been called and will continue to "work". You can have a
class defining both methods and still have only one of the two methods
called during the life time of the instance:

$foo = new Foo;
echo serialize( $foo );
// end of script
// __sleep() is called, but never __wakeup()

$string = '<manually created serialized representation of object>';
$foo = unserialize( $string );
// end of script
// __wakeup() is called, but never __sleep()

> And what you're saying is that the destructor (__sleep()) is called
> after a constructor (__construct(), __clone() or __wakeup()).

I said the exact opposite: __sleep() is called *before* the
corresponding __wakeup().

And look what the PHP manual has to say (emphasis mine):

<http://de2.php.net/manual/en/language.oop5.magic.php#object.wakeup>:
"Conversely, unserialize() checks for the presence of a function with
the magic name __wakeup(). If present, this function can *reconstruct*
any resources that the object may have."

(So __wakeup() is meant to "reconstruct" something, thus clearly acting
as a constructor.)

<http://de2.php.net/manual/en/class.serializable.php>
"Classes that implement this interface no longer support __sleep() and
__wakeup(). The method serialize is called whenever an instance needs to
be serialized. This does not invoke __destruct() or has any other side
effect unless programmed inside the method. When the data is
unserialized the class is known and the appropriate unserialize() method
is called as a *constructor* instead of calling __construct()."

(Clearly, unserialize() replaces __wakeup(), and if unserialize() acts
as a constructor, then so does __wakeup() which it replaces.)

Greetings,
Thomas

--
Ce n'est pas parce qu'ils sont nombreux à avoir tort qu'ils ont raison!
(Coluche)

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[Message index]

		out of sheer curiosity... By: Leonardo Azpurua on Tue, 27 March 2012 17:01
		Re: out of sheer curiosity... By: alvaro.NOSPAMTHANX on Tue, 27 March 2012 17:06
		Re: out of sheer curiosity... By: Leonardo Azpurua on Tue, 27 March 2012 17:34
		Re: out of sheer curiosity... By: Thomas 'PointedEars' on Wed, 28 March 2012 19:12
		Re: out of sheer curiosity... By: Leonardo Azpurua on Thu, 29 March 2012 00:53
		Re: out of sheer curiosity... By: M. Strobel on Thu, 29 March 2012 08:00
		Re: out of sheer curiosity... By: Leonardo Azpurua on Thu, 29 March 2012 09:53
		Re: out of sheer curiosity... By: The Natural Philosoph on Thu, 29 March 2012 10:46
		Re: out of sheer curiosity... By: M. Strobel on Thu, 29 March 2012 12:02
		Re: out of sheer curiosity... By: Erwin Moller on Thu, 29 March 2012 12:33
		Re: out of sheer curiosity... By: The Natural Philosoph on Thu, 29 March 2012 13:37
		Re: out of sheer curiosity... By: Erwin Moller on Thu, 29 March 2012 13:59
		Re: out of sheer curiosity... By: The Natural Philosoph on Thu, 29 March 2012 16:58
		Re: out of sheer curiosity... By: Jerry Stuckle on Thu, 29 March 2012 13:39
		Re: out of sheer curiosity... By: Erwin Moller on Thu, 29 March 2012 14:21
		Re: out of sheer curiosity... By: The Natural Philosoph on Thu, 29 March 2012 17:09
		Re: out of sheer curiosity... By: Tim Streater on Thu, 29 March 2012 21:07
		Re: out of sheer curiosity... By: M. Strobel on Thu, 29 March 2012 21:43
		Re: out of sheer curiosity... By: The Natural Philosoph on Fri, 30 March 2012 03:52
		Re: out of sheer curiosity... By: Jerry Stuckle on Thu, 29 March 2012 20:11
		Re: out of sheer curiosity... By: Tim Streater on Thu, 29 March 2012 21:01
		Re: out of sheer curiosity... By: Jerry Stuckle on Thu, 29 March 2012 23:29
		Re: out of sheer curiosity... By: M. Strobel on Sun, 08 April 2012 20:50
		Re: out of sheer curiosity... By: Jerry Stuckle on Sun, 08 April 2012 21:15
		Re: out of sheer curiosity... By: M. Strobel on Sun, 08 April 2012 22:39
		Re: out of sheer curiosity... By: The Natural Philosoph on Sun, 08 April 2012 23:59
		Re: out of sheer curiosity... By: Jerry Stuckle on Mon, 09 April 2012 00:28
		Re: out of sheer curiosity... By: Jerry Stuckle on Mon, 09 April 2012 00:24
		Re: out of sheer curiosity... By: M. Strobel on Mon, 09 April 2012 09:29
		Re: out of sheer curiosity... By: Jerry Stuckle on Mon, 09 April 2012 12:27
		Re: out of sheer curiosity... By: Thomas Mlynarczyk on Mon, 09 April 2012 13:20
		Re: out of sheer curiosity... By: Jerry Stuckle on Mon, 09 April 2012 16:03
		Re: out of sheer curiosity... By: Thomas Mlynarczyk on Mon, 09 April 2012 18:04
		Re: out of sheer curiosity... By: Jerry Stuckle on Mon, 09 April 2012 18:37
		Re: out of sheer curiosity... By: Thomas Mlynarczyk on Mon, 09 April 2012 20:50
		Re: out of sheer curiosity... By: Jerry Stuckle on Tue, 10 April 2012 00:17
		Re: out of sheer curiosity... By: M. Strobel on Tue, 10 April 2012 08:05
		Re: out of sheer curiosity... By: Thomas Mlynarczyk on Tue, 10 April 2012 11:28
		Re: out of sheer curiosity... By: M. Strobel on Tue, 10 April 2012 16:54
		Re: out of sheer curiosity... By: Thomas Mlynarczyk on Tue, 10 April 2012 18:10
		Re: out of sheer curiosity... By: M. Strobel on Tue, 10 April 2012 18:23
		Re: out of sheer curiosity... By: Thomas Mlynarczyk on Tue, 10 April 2012 21:17
		Re: out of sheer curiosity... By: Jerry Stuckle on Tue, 10 April 2012 21:11
		Re: out of sheer curiosity... By: Thomas Mlynarczyk on Tue, 10 April 2012 21:30
		Re: out of sheer curiosity... By: Jerry Stuckle on Tue, 10 April 2012 23:43
		Re: out of sheer curiosity... By: Jerry Stuckle on Tue, 10 April 2012 21:08
		Re: out of sheer curiosity... By: M. Strobel on Wed, 11 April 2012 08:40
		Re: out of sheer curiosity... By: Jerry Stuckle on Tue, 10 April 2012 11:58
		Re: out of sheer curiosity... By: Tim Streater on Tue, 10 April 2012 15:04
		Re: out of sheer curiosity... By: Jerry Stuckle on Tue, 10 April 2012 16:10
		Re: out of sheer curiosity... By: Thomas Mlynarczyk on Tue, 10 April 2012 16:18
		Re: out of sheer curiosity... By: The Natural Philosoph on Tue, 10 April 2012 17:20
		Re: out of sheer curiosity... By: M. Strobel on Tue, 10 April 2012 17:31
		Re: out of sheer curiosity... By: Jerry Stuckle on Tue, 10 April 2012 21:20
		Re: out of sheer curiosity... By: Thomas Mlynarczyk on Tue, 10 April 2012 21:57
		Re: out of sheer curiosity... By: Jerry Stuckle on Tue, 10 April 2012 23:50
		Re: out of sheer curiosity... By: Tim Streater on Tue, 10 April 2012 16:41
		Re: out of sheer curiosity... By: Thomas Mlynarczyk on Tue, 10 April 2012 15:25
		Re: out of sheer curiosity... By: Jerry Stuckle on Tue, 10 April 2012 16:16
		Re: out of sheer curiosity... By: Thomas Mlynarczyk on Tue, 10 April 2012 11:44
		Re: out of sheer curiosity... By: Jerry Stuckle on Tue, 10 April 2012 12:04
		Re: out of sheer curiosity... By: Thomas Mlynarczyk on Tue, 10 April 2012 15:37
		Re: out of sheer curiosity... By: Jerry Stuckle on Tue, 10 April 2012 16:19
		Re: out of sheer curiosity... By: Thomas Mlynarczyk on Tue, 10 April 2012 16:44
		Re: out of sheer curiosity... By: Jerry Stuckle on Tue, 10 April 2012 21:23
		Re: out of sheer curiosity... By: Scott Johnson on Mon, 09 April 2012 18:50
		Re: out of sheer curiosity... By: Thomas Mlynarczyk on Mon, 09 April 2012 21:03
		Re: out of sheer curiosity... By: Scott Johnson on Mon, 09 April 2012 22:27
		Re: out of sheer curiosity... By: Jerry Stuckle on Tue, 10 April 2012 00:25
		Re: out of sheer curiosity... By: Thomas Mlynarczyk on Tue, 10 April 2012 10:48
		Re: out of sheer curiosity... By: Jerry Stuckle on Tue, 10 April 2012 12:06
		Re: out of sheer curiosity... By: Leonardo Azpurua on Tue, 10 April 2012 12:22
		Re: out of sheer curiosity... By: Jerry Stuckle on Tue, 10 April 2012 16:20
		Re: out of sheer curiosity... By: Leonardo Azpurua on Tue, 10 April 2012 16:33
		Re: out of sheer curiosity... By: Jerry Stuckle on Tue, 10 April 2012 21:28
		Re: out of sheer curiosity... By: Thomas Mlynarczyk on Tue, 10 April 2012 22:13
		Re: out of sheer curiosity... By: Jerry Stuckle on Tue, 10 April 2012 23:53
		Re: out of sheer curiosity... By: Thomas Mlynarczyk on Wed, 11 April 2012 20:17
		Re: out of sheer curiosity... By: Jerry Stuckle on Wed, 11 April 2012 20:30
		Re: out of sheer curiosity... By: Jerry Stuckle on Tue, 10 April 2012 00:22
		Re: out of sheer curiosity... By: Thomas Mlynarczyk on Tue, 10 April 2012 10:43
		Re: out of sheer curiosity... By: Jerry Stuckle on Tue, 10 April 2012 12:11
		Re: out of sheer curiosity... By: Thomas Mlynarczyk on Tue, 10 April 2012 16:15
		Re: out of sheer curiosity... By: M. Strobel on Tue, 10 April 2012 17:09
		Re: out of sheer curiosity... By: Thomas Mlynarczyk on Tue, 10 April 2012 18:17
		Re: out of sheer curiosity... By: M. Strobel on Tue, 10 April 2012 18:25
		Re: out of sheer curiosity... By: Thomas Mlynarczyk on Tue, 10 April 2012 21:21
		Re: out of sheer curiosity... By: Jerry Stuckle on Tue, 10 April 2012 21:34
		Re: out of sheer curiosity... By: Thomas Mlynarczyk on Tue, 10 April 2012 23:00
		Re: out of sheer curiosity... By: Jerry Stuckle on Tue, 10 April 2012 23:54
		Re: out of sheer curiosity... By: Thomas Mlynarczyk on Wed, 11 April 2012 20:10
		Re: out of sheer curiosity... By: Jerry Stuckle on Wed, 11 April 2012 20:31
		Re: out of sheer curiosity... By: Thomas Mlynarczyk on Wed, 11 April 2012 20:40
		Re: out of sheer curiosity... By: Jerry Stuckle on Thu, 12 April 2012 04:02
		Re: out of sheer curiosity... By: M. Strobel on Thu, 12 April 2012 10:00
		Re: out of sheer curiosity... By: Jerry Stuckle on Thu, 12 April 2012 11:45

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