Abu Warez wrote:
> --- On Fri, 6/27/08, Thijs Lensselink <[EMAIL PROTECTED]> wrote:
>
>> From: Thijs Lensselink <[EMAIL PROTECTED]>
>> Subject: Re: [PHP] unset and circular references
>> To: php-general@lists.php.net
>> Date: Friday, June 27, 2008, 5:21 PM
>> Quoting Abu Warez <[EMAIL PROTECTED]>:
>>
>>
>
>
>> I think this happens because there is still a reference to
>>
> the B object.
>
>> According to the manual :
>>
>> The destructor method will be called as soon as all
>> references to a
>> particular object are removed or when the object is
>> explicitly
>> destroyed or in any order in shutdown sequence.
>>
>> So as long as A has a reference to B the __destructor will
>> not be called.
>>
>
> I think you mean: "As long as B has a ref to A (which, indeed, creates B),
> the destructor of A will not be called".
>
My bad. that's what i meant.
> I agree with that, but in this case the garbage collector should detect
> that the reference to object $a is from an object $m_b which is created (and
> maintained) again by the first object $a. In other words, if object $a is not
> needed then its member $m_b (which has a reference to $a) is not needed
> neither. So in this case, in my opinion, if one wants to destory object $a
> then the reference from $m_b to $a should not count.
>
That would still leave a reference from B to A. That's why it doesn't
get unset. If you unset B before unsetting A the problem is resolved.
> This issue is really frustrating because because in my code I have something
> like (where $a is of type class A):
>
> for ( $id ... )
> {
> $a = daoMyClass->LoadById( $id );
> .... modify $a ...
> /* persist modified $a */
> daoMyClass->Update( $a );
> unset( $a );
> }
>
> unset, as stated, does not destroy $a and all the loaded $a's remain in
> memory until the script ends. Rising the memory limit is not a solution
> because the count of $a objects grows between script calls. Any ideas?
>
> Thx,
> Abu
>
>
>
>
>
>
>
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