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Date: Mon, 14 Nov 2016 14:22:46 +0100
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Subject: Re: [PHP-DEV] How to detect classes with a count_elements handler in
 userland?
From: cmbecker69@gmx.de ("Christoph M. Becker")

On 13.11.2016 at 22:10, Craig Duncan wrote:

>> How about just making those classes implement the interface instead?
> 
> Christoph pointed out that there may be classes in extensions that use
> count_elements.

Furthermore, letting those classes implement Countable could break BC.

> Also it would make userland code simpler:
> is_countable($thing)
> vs
> is_array($thing) || $thing implements \Countable

Good catch!

Note that Craig has added is_countable() to PR #2185 (which implements
the RFC).  In my opinion, that is okay, but if anybody has objections,
we probably need another RFC.

-- 
Christoph M. Becker