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To: Nicolai Scheer <nicolai.scheer@gmail.com>
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Date: Wed, 24 Sep 2014 14:24:35 +0200
Message-ID: <1411561476.2303.4.camel@guybrush>
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Subject: Re: [PHP-DEV] Invokation on __toString() for object used as array
 key
From: johannes@schlueters.de (Johannes =?ISO-8859-1?Q?Schl=FCter?=)

Hi,

On Tue, 2014-09-23 at 10:04 +0200, Nicolai Scheer wrote:
> until 5 minutes ago I thought it would be perfectly legal to use an object
> as an array key, given that its __toString() method is in place.

Taking this sample code:::

<?php
class C {
    function __toString() {
        return "C";
    }
}

$a = [];

$c1 = new C();
$c2 = new C();

$a[$c1] = 23;
$a[$c2] = 42;
?>

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.


johannes