Re: Invokation on __toString() for object used as array key
| From: | Johannes Schlüter | Date: | Wed, 24 Sep 2014 12:24:35 +0000 |
| Subject: | Re: Invokation on __toString() for object used as array key | ||
| References: | 1 | Groups: | php.internals |
| Request: | Send a blank email to internals+get-77577@lists.php.net to get a copy of this message | ||
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