Object references... i simply don't understand it at all ;)

[kajaman (a.k.a. Hubert Łępicki ;))]

Hello!

I can't see any difference between:

$MyObject = new Object();
and
$MyObject =& new Object();

I used to think that if I use =&, I will be able to change variables of
the class and each new object created after that from the modified class
will have new, modified variables - but that seems not to be true...

I use PHP5 - is it the problem?

[rush]

Re: Object references... i simply don't understand it at all ;)

"kajaman (a.k.a. Hubert ŁÄTpicki ;))" <hubert5@wp.p l> wrote in message
news:cfadvk$nkg $1@nemesis.news .tpi.pl...[color=blue]
> $MyObject = new Object();
> and
> $MyObject =& new Object();
>
> I used to think that if I use =&, I will be able to change variables of
> the class and each new object created after that from the modified class
> will have new, modified variables - but that seems not to be true...[/color]

no if you add:

$AnotherMyObjec t = & $MyObject;

than changing $AnotherObject will also change $MyObject and other way
around.

rush
--

http://www.templatetamer.com/

[kajaman (a.k.a. Hubert Łępicki ;))]

Re: Object references... i simply don't understand it at all ;)

rush wrote:[color=blue]
>
> $AnotherMyObjec t = & $MyObject;
>
> than changing $AnotherObject will also change $MyObject and other way
> around.[/color]

Yes! And I understand it! But... Why people use:
$MyObject =& new Object
while it seems to work exacly the same as:
$MyObject = new Object...
strange :-/

[Michael Fesser]

Re: Object references... i simply don't understand it at all ;)

.oO(kajaman (a.k.a. Hubert ??picki ;)))
[color=blue]
>Yes! And I understand it! But... Why people use:
>$MyObject =& new Object
>while it seems to work exacly the same as:
>$MyObject = new Object...[/color]

Only in PHP5, it uses references by default. In PHP4 it's a difference.

Micha

[Kevin Thorpe]

Re: Object references... i simply don't understand it at all ;)

kajaman (a.k.a. Hubert Łępicki ;)) wrote:
[color=blue]
> rush wrote:
>[color=green]
>>
>> $AnotherMyObjec t = & $MyObject;
>>
>> than changing $AnotherObject will also change $MyObject and other way
>> around.[/color]
>
>
> Yes! And I understand it! But... Why people use:
> $MyObject =& new Object[/color]

PHP4: creates a new Object then points $MyObject at it
[color=blue]
> while it seems to work exacly the same as:
> $MyObject = new Object...[/color]

PHP4: creates a new Object then copies the contents of same into
$MyObject (MyObject is a copy)

In practical terms you end up with the same result. However you have a
spare object floating around to be cleaned up by the garbage collector.

[Matthias Esken]

Re: Object references... i simply don't understand it at all ;)

kajaman (a.k.a. Hubert ??picki ;)) schrieb:
[color=blue]
> Yes! And I understand it! But... Why people use:
> $MyObject =& new Object
> while it seems to work exacly the same as:
> $MyObject = new Object...[/color]

It's the same in PHP5.

In PHP4 it is different:

$MyObject = &new Object;
creates a new instance and $MyObject get's a reference to it.

$MyObject = new Object;
creates a new instance and copies it to $MyObject.

Regards,
Matthias

[kajaman (a.k.a. Hubert Łępicki ;))]

Re: Object references... i simply don't understand it at all ;)

Kevin Thorpe wrote:[color=blue]
> kajaman (a.k.a. Hubert Łępicki ;)) wrote:
>[color=green]
>> rush wrote:
>>[color=darkred]
>>>
>>> $AnotherMyObjec t = & $MyObject;
>>>
>>> than changing $AnotherObject will also change $MyObject and other way
>>> around.[/color]
>>
>>
>>
>> Yes! And I understand it! But... Why people use:
>> $MyObject =& new Object[/color]
>
>
> PHP4: creates a new Object then points $MyObject at it
>[color=green]
>> while it seems to work exacly the same as:
>> $MyObject = new Object...[/color]
>
>
> PHP4: creates a new Object then copies the contents of same into
> $MyObject (MyObject is a copy)
>
> In practical terms you end up with the same result. However you have a
> spare object floating around to be cleaned up by the garbage collector.[/color]
Thank you very much, now I see it clear :).