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Date: Wed, 24 Sep 2014 20:45:31 +0100
Cc: Nicolai Scheer <nicolai.scheer@gmail.com>,
 PHP Internals <internals@lists.php.net>
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References: <CAOg_pRQFYY9rpujHBC8DzaTfJ_3RPnrzpbuBoSRNuS-+A4qPbg@mail.gmail.com> <1411561476.2303.4.camel@guybrush>
To: =?windows-1252?Q?Johannes_Schl=FCter?= <johannes@schlueters.de>
Subject: Re: [PHP-DEV] Invokation on __toString() for object used as array key
From: ajf@ajf.me (Andrea Faulds)


On 24 Sep 2014, at 13:24, Johannes Schl=FCter <johannes@schlueters.de> =
wrote:

> Taking this sample code:::
>=20
> <?php
> class C {
>    function __toString() {
>        return "C";
>    }
> }
>=20
> $a =3D [];
>=20
> $c1 =3D new C();
> $c2 =3D new C();
>=20
> $a[$c1] =3D 23;
> $a[$c2] =3D 42;
> ?>
>=20
> There the assumption would be that this leads to an array $a with two
> elements, where in fact there is only one if __toString() is being
> called. The only thing "making sense" would be using using the objects
> identity (i.e. via spl_object_hash()) everything else leads to issues.

I=92m not sure this is a fair example. Don=92t classes usually implement =
a `__toString()` that is based on the data they contain? If they don=92t, =
I=92m not sure they=92re useful for indexing anyway.

--
Andrea Faulds
http://ajf.me/