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References: <CAF+90c-jYwb9o9aAuv-VESF7kUpF1QHq=9o4kPF5JoToUnLrGQ@mail.gmail.com>
 <CAEMvS4GbFVLCe-ebwNsnn7eLkWTtMKFux3fQn8pV-5HNczx20g@mail.gmail.com>
In-Reply-To: <CAEMvS4GbFVLCe-ebwNsnn7eLkWTtMKFux3fQn8pV-5HNczx20g@mail.gmail.com>
Date: Sat, 14 Aug 2021 17:17:45 +0200
Message-ID: <CAJmy8YGJSaR81cd-cWHmwb4+HAyT9OXnXKhGjFhkYxB9Aizpxg@mail.gmail.com>
To: PHP internals <internals@lists.php.net>
Content-Type: multipart/alternative; boundary="0000000000008b0e4405c9867a7a"
Subject: Re: [PHP-DEV] Unwrap reference after foreach
From: divinity76@gmail.com (Hans Henrik Bergan)

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well today you can do
foreach($it as &$value){...} unset($value);
- which is pretty close, but it will break with
$value="initial";foreach($it as &$value){...}unset($value); echo $value;
here $value will not be "initial", it will be undefined, however you *CAN*
do

$value="initial";(function()use(&$it){foreach($it as
&$value){...}unset($value);})(); echo $value;

and it will still contain "initial" and here the unset is even unnecessary,
but yeah..
 usually people do not go to such lengths to get a contained variable scope
^^


On Sat, 14 Aug 2021 at 15:23, Hossein Baghayi <hossein.baghayi@gmail.com>
wrote:

> On Fri, 13 Aug 2021 at 17:59, Nikita Popov <nikita.ppv@gmail.com> wrote:
>
> > I'd like to address a common footgun when using foreach by reference:
> > https://wiki.php.net/rfc/foreach_unwrap_ref
> >
>
> Hello,
> I had a question regarding this.
> Wouldn't it be possible to limit ```$value```'s scope to only foreach's
> block then discard it? Unless it was already defined elsewhere.
>
> ```
> foreach($nice_stuff as &$value) {} //we are done here and no need to keep
> value around.
>
> echo $value; // $value is Undefined here.
>
> $value = null;
> foreach($stuff as &$value) {} //we can keep the value here since it doesn't
> belong to foreach.
>
> echo $value; // prints some fancy pancy stuff
> ```
>

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