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Date: Thu, 17 Sep 2015 22:41:52 +1000
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Cc: internals <internals@lists.php.net>
Content-Type: multipart/alternative; boundary=001a114914b4207f81051ff0bfc5
Subject: Re: [PHP-DEV] PHP 7.1 - Address PHPSadness #28?
From: terry@terah.com.au (Terry Cullen)

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Content-Type: text/plain; charset=UTF-8
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Hi,

On 17 September 2015 at 19:01, Rowan Collins <rowan.collins@gmail.com>
wrote:

> On 17 September 2015 02:17:59 BST, Robert Williams <rewilliams@thesba.com=
>
> wrote:
> > An unset variable is not null. Rather, it=E2=80=99s
> >completely undefined, and PHP yells at you for just that reason if you
> >try to access it. Then, it turns around and tries to appease you by
> >giving you null.
>
>
> I see it as rather the other way around: it happily gives you a null, but
> then says "oh, by the way, you never actually initialised that variable t=
o
> null". Not an error, just a friendly aside.
>
>
>
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> PHP Internals - PHP Runtime Development Mailing List
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>
>
Here is an example where exists would be useful;
// input is {name:'Ted', birth_dt: null}
$input =3D json_decode(file_get_contents('php://input'));
// I should have used property_exists() instead of isset().. wasn't
expecting a null..
if ( isset($input->birth_dt) && ! isValidBirthDate($input->birth_dt) )
{
    throw new Exception('Bad birth date');
}
saveToDb($input);  // Oh no... I clobbered birth date

=E2=80=8BTerry=E2=80=8B

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