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Date: Wed, 11 Nov 2020 17:39:44 +0000
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To: Hans Henrik Bergan <divinity76@gmail.com>
Cc: PHP internals <internals@lists.php.net>
Content-Type: text/plain; charset="UTF-8"
Subject: Re: [PHP-DEV] [RFC] Draft - Closure self reference
From: Danack@basereality.com (Dan Ackroyd)

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 this.

Levi Morrison wrote:
> Is there any way we can spell it `__FUNCTION__`?

I think using some sort of constant, rather than a magic variable
sounds is probably the way to go. I would hope we could find something
better than that as:

return __FUNCTION__($n-1) + __FUNCTION__($n-2);

is pretty hard on my eyes.

I think I'll wander over to the 'Support for <func>::function syntax' thread...

cheers
Dan
Ack


# PHP

function foo1() {
    function bar() {}
}

function foo2() {
    function bar() {}
}

foo1();
foo2();

// Fatal error: Cannot redeclare bar()


# JS

function foo1() {
  var fn = function TheClosuresLocalName(){
    console.log("I am closure inside foo1");
  }
  return fn;
}

function foo2() {
  var fn = function TheClosuresLocalName(){
    console.log("I am closure inside foo2");
  }
  return fn;
}

fn1 = foo1();
fn2 = foo2();
fn1();
fn2();

"I am closure inside foo1"
"I am closure inside foo2"