Newsgroups: php.internals
Path: news.php.net
Xref: news.php.net php.internals:54453
Mailing-List: contact internals-help@lists.php.net; run by ezmlm
Received-SPF: error (pb1.pair.com: domain hoa-project.net from 87.106.212.190 cause and error)
Message-ID: <4E3F8D43.7000404@hoa-project.net>
Date: Mon, 08 Aug 2011 09:16:19 +0200
Reply-To: ivan.enderlin@hoa-project.net
User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.7; rv:5.0) Gecko/20110624 Thunderbird/5.0
MIME-Version: 1.0
To: internals@lists.php.net
Content-Type: text/plain; charset=windows-1252; format=flowed
Content-Transfer-Encoding: quoted-printable
Subject: Add \Countable support to \Closure
From: ivan.enderlin@hoa-project.net ("Ivan Enderlin @ Hoa")

Hi Internals,

I would like to suggest you a new feature (for PHP5.4 or maybe next).=20
The idea is to implement the \Countable interface into closures to=20
easily count the arguments number. I know that it is already possible=20
with reflection [1] but it could be a comfortable trick I think.
Subsidiary questions: do we include optional arguments in our calculation=
?

Here is a trivial example:

    class Closure implements \Countable { =85 }
    $f =3D function ( $x, $y, $z ) { =85 };
    var_dump(count($f));
    // int(3)

Javascript already implements this [2]:

    var f =3D function ( x, y, z ) { =85 };
    console.log(f.length);


Thoughts?


Best regards.

[1] <http://php.net/reflectionfunctionabstract.getnumberofparameters>
[2]=20
<https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/Fun=
ction/length>

--=20
Ivan Enderlin
Developer of Hoa
http://hoa.42/ or http://hoa-project.net/

Member of HTML and WebApps Working Group of W3C
http://w3.org/