Everything

php

Home » Project » Newsgroups » php.internals » Coalesce assign operator (??=) implemented »

Coalesce assign operator (??=) implemented

php.internals

Nikita Popov

7 years ago

Hi internals,

Some time ago an RFC for the ??= operator has been accepted:
https://wiki.php.net/rfc/null_coalesce_equal_operator

However, due to implementation difficulties, the RFC hasn't landed since
then. I'm happy to say that these difficulties are resolved now, and ??=
has landed with
https://github.com/php/php-src/commit/a50198d0fef652ca052cda642d6e98a9101eb73f
.

To summarize the important ??= semantics: $a ??= $b is roughly equivalent
to $a ?? ($a = $b). In $a[foo()] ??= bar() the function foo() will be
evaluated exactly once, and bar() will be evaluated iff $a[foo()] is null
(or unset).

Regards,
Nikita

Björn Larsson

7 years ago

Hi,

Excellent work! I have been waiting for this :)

Sara, I came to think on the Short ternary Assignment Operator RFC.
Would this implementation make that one more feasible, given it
passes a vote?

r//Björn Larsson

Den 2019-01-22 kl. 11:33, skrev Nikita Popov:

Nikita Popov

7 years ago

On Tue, Jan 22, 2019 at 4:51 PM Björn Larsson <bjorn.x.larsson@telia.com>
wrote:

> Hi,
>
> Excellent work! I have been waiting for this :)
>
> Sara, I came to think on the Short ternary Assignment Operator RFC.
> Would this implementation make that one more feasible, given it
> passes a vote?
>

From an implementation perspective ?:= is nearly identical to ??=, so
implementing it should be quite simple now. Whether an RFC for it would
pass is a different question, I'm not a big fan personally...

Nikita