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

[kajaman (a.k.a. Hubert �ępicki ;))]

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]

"kajaman (a.k.a. Hubert Å�ÄTpicki ;))" <hu*****@wp.pl> wrote in message
news:cf**********@nemesis.news.tpi.pl...

$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...

no if you add:

$AnotherMyObject = & $MyObject;

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

rush
--

http://www.templatetamer.com/

[kajaman (a.k.a. Hubert �ępicki ;))]

rush wrote:

$AnotherMyObject = & $MyObject;

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

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]

.oO(kajaman (a.k.a. Hubert ??picki ;)))

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

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

Micha

[Kevin Thorpe]

kajaman (a.k.a. Hubert �ępicki ;)) wrote:

rush wrote:

$AnotherMyObject = & $MyObject;

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

Yes! And I understand it! But... Why people use:
$MyObject =& new Object

PHP4: creates a new Object then points $MyObject at it
while it seems to work exacly the same as:
$MyObject = new Object...

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]

kajaman (a.k.a. Hubert ??picki ;)) schrieb:

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

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 �ępicki ;))]

Kevin Thorpe wrote:

kajaman (a.k.a. Hubert �ępicki ;)) wrote:

rush wrote:

$AnotherMyObject = & $MyObject;

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

Yes! And I understand it! But... Why people use:
$MyObject =& new Object

PHP4: creates a new Object then points $MyObject at it

while it seems to work exacly the same as:
$MyObject = new Object...

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.

Thank you very much, now I see it clear :).