On Wed, Feb 12, 2020 at 4:58 AM Mike Schinkel <[email protected]> wrote:
>
> Or best would be to add ::nameof for functions, method, classes, interfaces
> and traits
One problem is how would `x::nameof` resolve when you have several `x`
symbols (of distinct kinds) in scope?
```
namespace Theirs {
class Foo {}
const BAR = 2;
function qux() { return '3'; }
}
namespace Mine {
use Theirs\Foo as x;
use const Theirs\BAR as x;
use function Theirs\qux as x;
var_dump(new x); // object(Theirs\Foo)#1
var_dump(x); // int(2)
var_dump(x()); // string(1) "3"
// *** hypothetical: ***
assert(x::class === 'Theirs\Foo');
assert(x::const === 'Theirs\BAR');
assert(x::function === 'Theirs\qux');
assert(x::nameof === ???);
}
```
> Returning a _closure_ instead of a string would be providing a feature we
> _already_ have instead of one we do _not_ have.
>
> If we had ::function returning a string we could use Closure::fromCallable()
> to get a closure. Or today just use fn() => myfunc().
>
> But if ::function instead returned a closure then there still would be no way
> to extract the name of a function as a string from a symbol where PHP can
> throw a warning if it does not recognize the symbol, such as in the case of a
> typo.
>
> Seems to me having a shorter syntax to get a closure is an orthogonal concern.
>
> If we want a shorthand for closure we should create an additional syntax for
> it but still provide a way to extract a function's name as a string from its
> symbol since that is currently _not_ possible. Getting a closure from a
> function symbol currently _is_ possible.
>
> Much better to provide ::function to return the name of the function and
> ::closure get a closure that can call the function.
>
> Or have ::function to return the name of the function and provide a syntax
> something like ${myfunc} to return a closure, which has been suggested later
> in this thread.
That might deserve consideration indeed...
--
Guilliam Xavier
--
PHP Internals - PHP Runtime Development Mailing List
To unsubscribe, visit: http://www.php.net/unsub.php
