Re: [PHP-DEV] Weak references

Ack. Helps if I 'chmod a+r ~/public_html/php-ext-weakref.tgz'.

Chris

On Sat, 8 Mar 2003, Chris Vandomelen wrote:

> I've written a simple extension for supporting weak (non-refcounted)
> references in PHP, so that object graphs which reference themselves will
> function properly. I don't know if this will be useful to anyone else, but
> the code for the extension can be found at
> http://4.61.245.27/~chrisv/php-ext-weakref.tgz. (Until the DSL line that
> I'm in front of decides that it's going to get a new IP address, anyway..)
>
> The extension implements 2 functions:
> 	resource(weak reference) weakref(object $o): Returns a resource
> 		representing the input object. The reference is not
> 		counted against the object, and becomes invalid when the
> 		refcount of $o becomes 0.
> 	object weakref_get(resource(weak reference) $r): If the object
> 		that $r represents is still valid, this increases the
> 		refcount on the object and returns it. Otherwise it
> 		returns false.
>
> It should only compile against ZE2, as it needs access to
> EG(objects_store) to check and see if an object reference is still valid
> or not. (Unless there is some other way of checking to see if an object ID
> still exists, which I didn't happen to spot during my quick browsing of
> the source.)
>
> It's one of those little things that happens to seem like a good idea
> (being able to reference parent objects from a child object is a quite
> handy feature at times, especially when working with stuff that looks like
> DOM trees and whatnot.)
>
> Chris
>
>
>
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