Re: [Discussion] Why can't I do "{$a::class}"?
On Sun, May 19, 2024 at 10:30 AM Peter Stalman <[email protected]> wrote:
> Hi Internals,
>
> Obviously we can't use constants or functions directly in strings using
> variable parsing, I assume because it lacks the easily detectable $.
>
> However, we _can_ use methods because the object variable has the $, which
> I assume is the reason methods work and functions don't.
>
> I feel like it's something that _could_ have been added when dynamic
> access of static members support was added in 5.3.0, but maybe it was
> overlooked or decided against? Consider:
>
> ```
> <?php
>
> $a = new A();
>
> echo " {A::$static_property} \n"; // doesn't work (unless $static_property
> is a variable)
> echo " {$a::$static_property} \n"; // works
>
> echo " {A::static_method()} \n"; // doesn't work (just text)
> echo " {$a::static_method()} \n"; // works
>
> echo " {A::constant} \n"; // doesn't work
> echo " {$a::constant} \n"; // doesn't work either, but why?
>
> ?>
> ```
>
>
> Also, as a side note, why does this hack below work? It seems like
> something that would use eval(), but doesn't. Take a look:
>
> https://3v4l.org/aPCSD
>
> I found it at the bottom of the manual entry for Strings[1]. Not
> something I would use, but it's interesting to see.
>
> Thanks,
> Peter
>
> [1]: https://www.php.net/manual/en/language.types.string.php#91628
>
Hi, Peter!
> Also, as a side note, why does this hack below work?
It's not a hack. Variables, including callable ones with any arguments are
allowed to be interpolated. See another example: https://3v4l.org/BJUvL
--
Regards,
Valentin Udaltsov
Thread (6 messages)