Re: [PHP-DEV] Help on ZVAL (array) memory management From: Andi Gutmans (andi <email protected>)
Date: 12/27/00

I don't know exactly what you're doing here but you should most probably
use zval_ptr_dtor(&myzval); This makes sure that the zval is only destroyed
if the reference count is 0; otherwise it only reduces reference count.

Andi

At 11:11 PM 12/26/00 +0100, Stig Venaas wrote:
>On Tue, Dec 26, 2000 at 03:49:01PM -0500, Huajie Liu wrote:
> > Thanks Stig,
> >
> > What I am trying to do is to convert a C tree structure to
> > php array (hashtable) so that I can use this data structure
> > from my php scripts. I tried to use zval_dtor() but it seems
> > not to free the whole structure contained by zval, including
> > the hashtable in hashtable.
> >
> > In the my code snippet, if I zval_dtor(myzval), will 'zarray'
> > get freed too?
>
>Yes I think so.
>
>array_init(myzval) will set myzval->value.ht->pDestructor to
>ZVAL_PTR_DTOR.
>
>When you later do zval_dtor(myzval), it will do
>zend_hash_destroy(myzval->value.ht) which will then do
>ZVAL_PTR_DTOR(q->pData) for each element in the hash (q).
>Each pData refers to a zval, and it will reduce the refcount of
>the zval, and if it becomes 0, it will do zval_dtor on it. So in
>your case, the effect should be that it calls zval_dtor(zarray)
>unless the refcount >1.
>
>If I'm wrong, someone that knows this better will hopefully correct me.
>A debugger should be able to help you a lot, just trace step by step
>what happens when you try to free myzval.
>
>Stig
>
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---
Andi Gutmans <andi <email protected>>
http://www.zend.com/

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