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Date: Thu, 29 Jan 2015 15:51:13 -0800
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To: Yasuo Ohgaki <yohgaki@ohgaki.net>, 
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Subject: Re: [PHP-DEV] Use of {} with member.
From: rasmus@lerdorf.com (Rasmus Lerdorf)

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On 01/29/2015 01:32 PM, Yasuo Ohgaki wrote:
> Hi all,
>=20
> I came across with bug #68947 https://bugs.php.net/bug.php?id=3D68947
> and realized small inconsistency.
>=20
> http://3v4l.org/ldZKl
>=20
> $obj->${array[$key]}; // Syntax error
> $obj->{$array[$key]}; // Works
>=20
> $obj->${key}; // E_NOTICE. Does not work
> $obj->{$key}; // Works
>=20
> echo "${array[$key]}"; // Works
> echo "{$array[$key]}"; // Works
>=20
> Of course, script/string parsing aren't the same. Are there technical
> reasons
> why ${value} is not allowed? If there are, we may encourage
>=20
> echo "{$array[$key]}"; // Works
>=20
> rather than
>=20
> echo "${array[$key]}"; // Works

That all seems expected to me. The original point of that bug report is
the BC break due to the uniform variable rfc. The change makes sense,
but just for the record, I have installed about 10 popular, and a couple
of not-so-popular, PHP apps and tested them on PHP 7 over the past week
and this was the only BC break that affected that set of 10 apps.

See:
https://github.com/rlerdorf/avalon/commit/18847d0fe65381977397271c79e04dd=
e72ef86f8

It is listed as a bullet point in a sea of other bullet points in the
UPGRADING file:

  . Indirect variable, property and method references are now
interpreted with left-to-right semantics. See details in:

https://wiki.php.net/rfc/uniform_variable_syntax#semantic_differences_in_=
existing_syntax


But we probably need a section devoted to BC breaks that includes some
real-world code examples.

-Rasmus


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