Alternatively, you could try to support polymorphism in classes :o) Then you
wouldn't need null references...
class X {
function a();
function a(MyObj $b);
}
Jevon Wright
----- Original Message -----
From: "Robert Silva" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Sunday, October 17, 2004 11:24 AM
Subject: RE: [PHP-DEV] Type hints with null default values
> PHP doesn't have a concept of a "null" reference though. So to say that
> every other language allows it is not a valid argument. The other
languages
> allow it because the language supports it. And that seems to be what the
> arguments against it centered around.
>
> I think a compromise would be to allow the argument to be optional but
still
> enforce the type hint. What this doesn't address fully is multiple
optional
> type hinted arguments.
>
> function A(ZObj $arg2=null, ZObj $arg3=null) {}
>
> How would you pass $arg3 if you didn't have anything to pass for $arg2.
> Maybe that's just an inherent restriction of the language...to pass $arg3,
> you have to pass a ZObj as $arg2.
>
> Someone else suggested adding null references to the language:
>
> ZObj $obj = null;
>
> But I don't think that is the right solution either not to mention the
> nightmare of actually implementing it.
>
>
> Bob
>
> -----Original Message-----
> From: Cristiano Duarte [mailto:[EMAIL PROTECTED]
> Sent: Saturday, October 16, 2004 3:01 PM
> To: [EMAIL PROTECTED]
> Subject: RE: [PHP-DEV] Type hints with null default values
>
> Robert Silva wrote:
>
> > I think Marcus B's final comments in the original discussion are right
on
> > track.
> >
> > Stab: I voted for NULL type hinted arguments before I voted against
them.
> >
> > The main thing that changed my mind, is that in PHP there is no such
thing
> > as a NULL object. I came to the conclusion that PHP wasn't broken, my
> > programming style/code was.
> >
> > My opinion is that they should stay as they are now although personally.
> >
> > Now with that said, I do think there needs to be a method to allow a
type
> > hinted parameter to be optional (but not necessarily null).
> That's what I'm asking for. :-)
> I'm not asking for null objects, just an optional parameter that must be
an
> object or a "null" reference.
> All OO languages I've ever programmed had this kind of reference(Java,
C++,
> Delphi, etc.)
>
> Cristiano Duarte
>
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