Re: RFC: Support Closures in constant expressions
| From: | Rob Landers | Date: | Mon, 04 Nov 2024 12:33:32 +0000 |
| Subject: | Re: RFC: Support Closures in constant expressions | ||
| References: | 1 2 3 4 5 | Groups: | php.internals |
| Request: | Send a blank email to internals+get-125904@lists.php.net to get a copy of this message | ||
On Mon, Nov 4, 2024, at 13:06, Tim Düsterhus wrote:
> Hi
>
> Am 2024-10-31 07:16, schrieb Larry Garfield:
> > Hm. It would never occur to me to use a function for a non-class
> > constant in the first place, so I don't know. :-) Frankly I can't
> > recall the last time I used a non-class constant period. :-)
> >
> > That said, PHP consts are already a bit squishy, and auto-capture is
> > always by value. That wouldn't give us a loophole?
>
> Here's another brainteaser:
>
> function foo(
> string $bar,
> Closure $baz = static fn () => $bar,
> ) {
> var_dump($baz());
> }
>
> foo('captured');
>
> What would you expect the semantics of that script to be?
Isn't this semantically equivalent to:
function foo(
string $bar,
Closure $baz,
) {
$baz = static fn () => $bar;
var_dump($baz());
}
foo('captured');
— Rob