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Re: out of sheer curiosity... [message #177635 is a reply to message #177633]

Wed, 11 April 2012 20:30

Jerry Stuckle
Messages: 2598
Registered: September 2010

Karma:

Senior Member

On 4/11/2012 4:17 PM, Thomas Mlynarczyk wrote:
> Jerry Stuckle schrieb:
>
>>> MyDatabaseSingleton::getInstance() ?
>>
>> What if you don't want a singleton? Many times I've had the need to
>> access different databases, for instance. You are limiting the
>> versatility of the class.
>
> MyDatabase::getConnection( $id )
>

Which once again doesn't reuse an existing connection, nor does it
specify what connection is being used. Which host? Which database?

If it's defined within the MyDatabase class, you're restricted to that
one connection/database. If it's defined in the serialized class,
you've limited the usefulness of that class.

All is resolved by passing a database object in the constructor of the
class. You are using the object the program wants - not one predefined
by the class itself.

>> By definition you can pass arguments to the constructor. That's why
>> unserialize() is not a good implementation.
>
> But how would you pass any constructor arguments to an unserialize()
> function anyway? You cannot be sure what the string to be unserialized
> really contains, so how would you know which constructor arguments to
> pass? This could be a job for __set_state(): unserialize() then wouldn't
> create objects, but simply call the __set_state() method on the class in
> question, passing the unserialized state information and leave it to
> that method to reconstruct the actual object. But this does not seem to
> be the way PHP works.
>
> Greetings,
> Thomas
>

Which is a big problem with unserialize(). Other languages handle it
quite well by having different constructors available. For instance,
there could be a constructor which takes the serialized object and an
array (or variable arg list) which would unserialize the data and use
the additional arguments.

But problems like this make almost any but the simplest objects useless
for any type of serialization.

--
==================
Remove the "x" from my email address
Jerry Stuckle
JDS Computer Training Corp.
jstucklex(at)attglobal(dot)net
==================

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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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