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Message-ID: <e666c3890901130758g75dcbdbw9e677a1198de9048@mail.gmail.com>
Date: Tue, 13 Jan 2009 16:58:07 +0100
Sender: ekneuss@gmail.com
To: "Mark van der Velden" <mark@dynom.nl>
Cc: internals@lists.php.net
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References: <496CB6BE.2000704@dynom.nl>
Subject: Re: [PHP-DEV] SPL ArrayAccess offsetExists default behavior
From: webmaster@colder.ch ("Etienne Kneuss")

Hello,

On Tue, Jan 13, 2009 at 4:43 PM, Mark van der Velden <mark@dynom.nl> wrote:
> Hi list,
>
> The following doesn't strike me as consistent behavior:
>
> $a           = new ArrayObject();
> $a["foobar"] = NULL;
>
> echo (int) isset( $a["foobar"] ); // Output: 1
>
>
> While it's technically correct, I find it confusing. The reason is probably
> because of a array_key_exists (or property_exists) check within
> offsetExists() that do not take return false on a NULL value, unlike
> isset().
>
> What say you ?

This is indeed a small inconsistency. The problem is that by its name,
offsetExists() should return true on those cases (similarly to
array_key_exists or property_exists). Since it is directly called
within isset(), isset() should return true as well. The problem is
that checking the value would cause a offsetGet() to be called, which
will be a BC break, so I'm not sure if it's worth changing.

Regards

>
>
> - Mark
>
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> PHP Internals - PHP Runtime Development Mailing List
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>
>
>



-- 
Etienne Kneuss
http://www.colder.ch

Men never do evil so completely and cheerfully as
when they do it from a religious conviction.
-- Pascal