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Date: Mon, 27 Jun 2016 11:41:10 -0400
Message-ID: <CAEYWF=407c35fOQft083kFOTPN-8B_FL1ep6h6YUBfJxMZg6DQ@mail.gmail.com>
To: Andreas Heigl <andreas@heigl.org>
Cc: =?UTF-8?Q?Karl_Pfl=C3=A4sterer?= <k@rl.pflaesterer.de>, 
	PHP internals <internals@lists.php.net>
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Subject: Re: [PHP-DEV] Possible Bug with Interface, Constants and Inheritance
From: bishop@php.net (Bishop Bettini)

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On Mon, Jun 27, 2016 at 11:31 AM, Andreas Heigl <andreas@heigl.org> wrote:

> Am 27.06.16 um 15:28 schrieb Karl Pfl=C3=A4sterer:
> > Andreas Heigl <andreas@heigl.org> writes:
> >
> >> Am 27.06.16 um 15:01 schrieb Karl Pfl=C3=A4sterer:
> >>> interface I1 { const C1 =3D '';}
> >>> class C3 implements I1 { const C1 =3D 'c2';}
> >>> $c3 =3D new C3;
> >>> var_dump($c3::C1);
> >>
> >> According to https://3v4l.org/jIcs6 it looks like that's intended
> >> behaviour ;)
> >
> > But why does it work in the CLI if I write the code (instead of using a
> > script)?  That's my question.
>
> It doesn't. At least not on my machine. This is the output I get:
>
>     $ php -v
>     PHP 7.1.0alpha2 (cli) (built: Jun 24 2016 13:50:28) ( NTS )
>     Copyright (c) 1997-2016 The PHP Group
>     Zend Engine v3.1.0-dev, Copyright (c) 1998-2016 Zend Technologies
>

Technically, this is a different version than reported. Nonetheless, on the
same version my REPL complains as well, I suspect because the original
report misspelled the INI setting ("-ddispplay_errors=3DOn", notice the
double "p"):

$ php -v
PHP 7.0.7 (cli) (built: May 28 2016 08:26:36) ( NTS )
Copyright (c) 1997-2016 The PHP Group
Zend Engine v3.0.0, Copyright (c) 1998-2016 Zend Technologies
    with Zend OPcache v7.0.6-dev, Copyright (c) 1999-2016, by Zend
Technologies
    with Xdebug v2.4.0, Copyright (c) 2002-2016, by Derick Rethans

$ php -a
Interactive shell

php > interface I1 { const C1 =3D ''; }
php > class C3 implements I1 { const C1 =3D 'c2'; }
PHP Fatal error:  Cannot inherit previously-inherited or override constant
C1 from interface I1 in php shell code on line 1
PHP Stack trace:
PHP   1. {main}() php shell code:0



> So it crashes with a fatal error when Implementing the interface. It'S
> interesting though that the script allows me to instantiate the class
> nonetheless. That's right.
>

Under normal interpretive operation, the Fatal terminates the script. But
in the case of the REPL command line, those are swallowed up and you can
keep going. Same as like:

php > foo();
PHP Warning:  Uncaught Error: Call to undefined function foo() in php shell
code:1
Stack trace:
#0 {main}
  thrown in php shell code on line 1
PHP Stack trace:
PHP   1. {main}() php shell code:0
php > echo 'hi';
hi

I'm not seeing any bugs here.

bishop

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