php-general Digest 7 Dec 2012 08:11:09 -0000 Issue 8057
Topics (messages 319807 through 319808):
Unset and __destruct
319807 by: Pierre du Plessis
319808 by: Sebastian Krebs
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--- Begin Message ---
Hi all
I searched the internet (probably not hard enough), and couldn't find a
decent answer.
I was wondering why, when calling unset on an object, it doesn't
automatically call the __destruct method (if it exists) on the object.
When unsetting an object, php doesn't automatically remove references to
other objects, and you need to manually call the __destruct method where
you can remove any references to other objects.
I know there is a lot of discussion around this topic, but couldn't find a
definate answer as to why this isn't the default behaviour.
Any clarification would greatly be appreciated.
--- End Message ---
--- Begin Message ---
2012/12/6 Pierre du Plessis <pie...@pcservice.co.za>
> Hi all
>
> I searched the internet (probably not hard enough), and couldn't find a
> decent answer.
>
> I was wondering why, when calling unset on an object, it doesn't
> automatically call the __destruct method (if it exists) on the object.
>
Thats because it was never intended :) The engine calls __destruct() right
before the GC frees the object, but unset() only decrease the refcount. The
next time the GC runs it will call the destructor and everythings fine
>
> When unsetting an object, php doesn't automatically remove references to
> other objects, and you need to manually call the __destruct method where
> you can remove any references to other objects.
>
Why? When the GC removes the object from the memory (which might be
slightly later) it also removes the references to associated objects and
when their refcount reaches 0 they will get removed as well. Whats the
problem?
>
> I know there is a lot of discussion around this topic, but couldn't find a
> definate answer as to why this isn't the default behaviour.
>
Why should it? Thats the way a GC works :?
>
> Any clarification would greatly be appreciated.
>
--
github.com/KingCrunch
--- End Message ---
