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Order of parent and child classes in EG(class_table)

php.internals

Sebastian Bergmann

19 years ago

Hi,

I am wondering whether a child class is always stored after its parent
class in EG(class_table) because I would like to rely on this behaviour
for the result of get_declared_classes().

Thanks,
Sebastian

--
Sebastian Bergmann                          http://sebastian-bergmann.de/
GnuPG Key: 0xB85B5D69 / 27A7 2B14 09E4 98CD 6277 0E5B 6867 C514 B85B 5D69

Stanislav Malyshev

19 years ago

>  I am wondering whether a child class is always stored after its parent
>  class in EG(class_table) because I would like to rely on this behaviour
>  for the result of get_declared_classes().

I think it's not written anywhere it should be so, but in fact it always
would be so since when you are defining child class you have to have
parent already in the class table. So unless some very nasty extension
would define classes in different order, it is always so.

--
Stanislav Malyshev, Zend Products Engineer
stas@zend.com  http://www.zend.com/

Tijnema !

19 years ago

On 3/26/07, Stanislav Malyshev <stas@zend.com> wrote:

> >  I am wondering whether a child class is always stored after its parent
> >  class in EG(class_table) because I would like to rely on this behaviour
> >  for the result of get_declared_classes().
>
> I think it's not written anywhere it should be so, but in fact it always
> would be so since when you are defining child class you have to have
> parent already in the class table. So unless some very nasty extension
> would define classes in different order, it is always so.

Logically it should be, but you cannot be sure it will be ALWAYS like
that. 99% of the time it probably is, but sometimes things aren't
going the way you expected :P

Tijnema

Andrei Zmievski

19 years ago

What about the case where dl() is used? AFAIK the classes defined in
dl()'ed files always go at the end of the class table.

-Andrei

On Mar 26, 2007, at 10:29 AM, Stanislav Malyshev wrote:

Stanislav Malyshev

19 years ago

> What about the case where dl() is used? AFAIK the classes defined in
> dl()'ed files always go at the end of the class table.

Any class that is defined goes at the end of the class table existing at
the time, no matter if it's dl() or not. If loaded extension defines
classes derived from existing ones, they would be after existing
classes. If it defines both parent and child class, then in theory it
could do it so that child class would enter the class table before the
parent class, but it'd be quite broken extension.

--
Stanislav Malyshev, Zend Products Engineer
stas@zend.com  http://www.zend.com/