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To: Dan Ackroyd <Danack@basereality.com>,
 Hans Henrik Bergan <divinity76@gmail.com>
Cc: PHP internals <internals@lists.php.net>
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Date: Wed, 11 Nov 2020 18:59:41 +0100
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Subject: Re: [PHP-DEV] [RFC] Draft - Closure self reference
From: cmbecker69@gmx.de ("Christoph M. Becker")

On 11.11.2020 at 18:39, Dan Ackroyd wrote:

> On Tue, 10 Nov 2020 at 17:39, Hans Henrik Bergan <divinity76@gmail.com> =
wrote:
>>
>> something i'm missing from Javascript is the ability to give names to
>> closures, ...the name is optional, and only visible inside the closure
>> itself, and unfortunately this is not legal in PHP, i wish it was.
>
> I really like that...but unfortunately that wouldn't work in PHP.
>
> In JS, when a function is declared inside another function, the name
> of it is limited to the scope of the containing function. In PHP, when
> a function is declared inside another function, it is put into the
> current namespace's global scope.
>
> Changing how scope works in PHP would be too large a change for just thi=
s.

In JavaScript, a named function expression is different to a function
declaration:

    var fn =3D function foo() {console.log('blah')}
    foo()
    =3D> Uncaught ReferenceError: foo is not defined

vs.

    function foo() {console.log('blah')}
    foo()
    =3D> blah

So the named function expression is still an anonymous function; the
label is only defined inside of the function body.

Christoph