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Date: Tue, 25 Aug 2015 23:26:38 -0400
Message-ID: <CAL+t6cHCaLtYzyexerY9eY14s4PYXR86AOVzwMMw2uNXpxt0Lw@mail.gmail.com>
To: Scott Arciszewski <scott@paragonie.com>
Cc: PHP Internals <internals@lists.php.net>
Content-Type: multipart/alternative; boundary=001a11c3888e246909051e2e6b72
Subject: Re: [PHP-DEV] PHP 7.1 - Address PHPSadness #28?
From: theanomaly.is@gmail.com (Sherif Ramadan)

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I get that it exists. I'm asking what is the usefulness of having a
function that tells you the variable is null? In theory this sounds great
and is actually very doable by checking the symbol table for the hash.
However, in practice, who actually has a use for this? Null is a special
value in PHP, so if you're assigning it to a variable explicitly you should
already know you've initialized that variable and can safely rely on if ($x
=== null) in your code.

I'm not confused about the differences. I'm questioning the usefulness of
such a function.

On Tue, Aug 25, 2015 at 11:18 PM, Scott Arciszewski <scott@paragonie.com>
wrote:

> Because $x exists.
>
> https://3v4l.org/kUJtP
> Scott Arciszewski
> Chief Development Officer
> Paragon Initiative Enterprises
>
>
> On Tue, Aug 25, 2015 at 11:16 PM, Sherif Ramadan
> <theanomaly.is@gmail.com> wrote:
> > Yes, because all undefined variables in PHP are implicitly null. As far
> as
> > PHP is concerned, if it's null, it's by definition _not defined_. Also,
> > still not seeing where a NOTICE is involved here? Those functions never
> give
> > errors.
> >
> > What is the usefulness of a function that merely returns true when a
> > variable is null?
> >
> > On Tue, Aug 25, 2015 at 11:13 PM, Scott Arciszewski <scott@paragonie.com
> >
> > wrote:
> >>
> >> On Tue, Aug 25, 2015 at 11:11 PM, Sherif Ramadan
> >> <theanomaly.is@gmail.com> wrote:
> >> > That's exactly what isset() does. isset/empty never raise errors.
> >> >
> >> > On Tue, Aug 25, 2015 at 11:09 PM, Scott Arciszewski
> >> > <scott@paragonie.com>
> >> > wrote:
> >> >>
> >> >> Hi everybody,
> >> >>
> >> >> Would anyone be interested in adding another helper like
> >> >> isset()/empty() simply called exists() which would return true if the
> >> >> variable is defined in the current scope (i.e. without raising an
> >> >> E_NOTICE)?
> >> >>
> >> >> It should be a simple change to add this function but it's too late
> >> >> for 7.0 so, if there is any interest, I would respectfully put it off
> >> >> until 7.1.
> >> >>
> >> >> Scott Arciszewski
> >> >> Chief Development Officer
> >> >> Paragon Initiative Enterprises <https://paragonie.com>
> >> >>
> >> >> --
> >> >> PHP Internals - PHP Runtime Development Mailing List
> >> >> To unsubscribe, visit: http://www.php.net/unsub.php
> >> >>
> >> >
> >> http://phpsadness.com/sad/28
> >> https://3v4l.org/2vrKG
> >>
> >> Not quite.
> >>
> >> Scott Arciszewski
> >> Chief Development Officer
> >> Paragon Initiative Enterprises <https://paragonie.com>
> >
> >
>

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