Re: [RFC] Draft - Closure self reference
| From: | Dan Ackroyd | Date: | Wed, 11 Nov 2020 17:39:44 +0000 |
| Subject: | Re: [RFC] Draft - Closure self reference | ||
| References: | 1 2 3 | Groups: | php.internals |
| Request: | Send a blank email to internals+get-112224@lists.php.net to get a copy of this message | ||
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"