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Date: Fri, 10 Jan 2020 21:44:30 +0000
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Subject: Re: [PHP-DEV] [RFC] Allow ::class on objects
From: rowan.collins@gmail.com (Rowan Tommins)

On 10/01/2020 17:29, Larry Garfield wrote:
> But having some kind of working way to reference a function that doesn't involve concatenating a string onto a namespace constant would be*super*  nice.  Whether it's called ::func or ::nameof I don't much care.
>
> Viz, replace this:
>
> $func = __NAMESPACE__ . '\myfunc`';
>
> With this:
>
> use My\Code\myfunc;
>
> $func = myfunc::nameof;


Note that the above example should be:

use function My\Code\myfunc;

$func = myfunc::nameof;


That's important, because we couldn't actually have one operator that 
resolved both types, either at compile time or run time. For instance, 
this is valid code:

namespace Whatever;
use Bar\Baz as foo;
use function Something\other as foo;
echo foo::class; // "Bar\Baz"
foo(); // runs Something\other(), not Bar\Baz()


A ::func operator would also need to deal with everybody's favourite 
name resolution: the dynamic fallback to global functions. In other 
words, this...

namespace Foo;
echo strlen::func;

...would need to print "Foo\strlen" if it was defined, and "strlen" if 
not. That would then make it odd if a completely undefined function 
didn't error, so I don't think it could match the current behaviour of 
::class.

Regards,

-- 
Rowan Tommins (né Collins)
[IMSoP]