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Date: Thu, 3 Sep 2020 11:04:51 -0500
Message-ID: <CAESVnVqpcFxrPcd2F7+83jyUnfaeHX_KtVR8GDKeDhBO_thyNg@mail.gmail.com>
To: David Rodrigues <david.proweb@gmail.com>
Cc: PHP internals <internals@lists.php.net>
Content-Type: multipart/alternative; boundary="00000000000033689505ae6aea60"
Subject: Re: [PHP-DEV] Draft RFC: foreach iteration of keys without values
From: pollita@php.net (Sara Golemon)

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On Thu, Sep 3, 2020 at 10:35 AM David Rodrigues <david.proweb@gmail.com>
wrote:

> Do you think that it could be proxied? I mean, optimize foreach
> (array_keys()...) syntax to not call array_keys() in fact, but a optimized
> version of foreach to handle key only. I don't know it opcache could do
> that, and if it already does.
>
>
I wouldn't use the word "proxied", but yes. In my mind the compiler would
see:

foreach(\array_keys($arr) as $key) {

and quietly transform that into:

foreach ($arr as $key => $_unusedVariableNameThatIsntEvenSpilledToTheScope)
{

Thus not iterating the array twice and creating a temporary array of key
names.

-Sara

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