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Date: Sun, 20 Sep 2015 15:05:52 +0100
To: Lester Caine <lester@lsces.co.uk>,internals@lists.php.net
Message-ID: <0CCD2508-4F6A-4C49-B833-892B8B87F6BE@gmail.com>
Subject: Re: [PHP-DEV] PHP 7.1 - Address PHPSadness #28?
From: rowan.collins@gmail.com (Rowan Collins)

On 20 September 2015 00:29:48 BST, Lester Caine <lester@lsces.co.uk> wrote:
>> The notices emitted by is_null are COMPLETELY IRRELEVANT.
>
>? is_null returns true if the variable exists and is NULL and throws a
>notice if the variable is not set WHY is that fact COMPLETELY
>IRRELEVANT?

is_null returns true in all the same situations as isset does. There is absolutely no difference except for whether it raises a notice.


> we have to put up with the notices because there is no CLEAN
>way to establish that a variable exists only that it is set.

You absolutely never have to put up with those notices, because if you use !isset instead of is_null, they go away, and the program continues to work in exactly the same way.

I understand that you would like a function to detect the (non-)existence of a variable, and are disappointed that isset is not that function, but that's a completely separate problem from how to avoid the notices.

Again, it is not the noise which is stopping your car from flying.

Regards,
-- 
Rowan Collins
[IMSoP]