http://www.zend.com/zend/art/under-php4-hood.php
and
http://www.zend.com/zend/art/ref-count.php
are articles that go into a bit more depth on this topic. Maybe not
as detailed as you'd like, but they explain a bit more about
how/why "PHP does it for you" is a valid reply to your question.
Gustavo Vieira Goncalves Coelho Rios wrote:
> Hi folks!
>
> I am a used C programmer and now my company decide to switch every non
> performance critical web stuf to php. Since i am just a php beginner i
> have some questions i could not find anywhere!
>
> As you may know, C does not provide any kind of support for garbage
> collection, every thing you want to be done you have to tell (in C) by
> yourself. But in PHP i have no ideia about how it manages memory. for
> instance:
>
> In C:
>
> str = (char *) malloc(10u);
>
> if i decide to alloc new memory for str (just for explanation purposes),
> and i do:
>
> str = (char *) malloc(33u);
>
> i would be in trouble, cause the reference for the previous allocated
> pool of memory would be lost.
> The approach could be to save the previous references or use realloc.
>
> Now, my doubt: How PHP deals with this:
>
> $query = "select * from apm where id=3";
>
> /* do my processing */
>
> /* and set query to a new string */
>
> $query = "Query done without errors";
>
> What will happen with the previous allocated memory for $query?
> I don't like my application eating memory without releasing it after
> they are no need any more.
>
> May some one explain how to prevent such scenarios ?
>
> Thanks a lot for your time and cooperation.
>
> best regrads.
>
> Gustavo Rios
>
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