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Date: Tue, 25 Feb 2020 21:27:58 +0100
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To: Michael Morris <tendoaki@gmail.com>
Cc: PHP internals <internals@lists.php.net>
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Subject: Re: [PHP-DEV] Thoughts on adopting Python's for/foreach else construct.
From: nikita.ppv@gmail.com (Nikita Popov)

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On Tue, Feb 25, 2020 at 8:19 PM Michael Morris <tendoaki@gmail.com> wrote:

> I don't remember if this has been discussed before, but I've been working
> with some listing code and wishing for a cleaner way to do this
>
> <?php
>   if (count($a) === 0) {
>     // code for no results
>   }
>   else {
>     foreach( $a as $key => $value) {
>       // code for iteration
>     }
>   }
> ?>
>
> How difficult would it be to make the following work in the interpreter?
>
> <?php
>   foreach($a as $key => $value) {
>     // code for iteration
>   }
>   else {
>     // code for no results
>   }
> ?>
>
> The code of the else clause executes if the foreach is never entered
> regardless of the reason (provided the code didn't outright crash)
>
> Thoughts.
>

See https://wiki.php.net/rfc/loop_else and https://wiki.php.net/rfc/loop_or
for previous proposals on the topic.

I believe an important concern from previous discussions was that this
breaks BC in a really bad way, due to the dangling else conflict. Which is
why the latter proposal used "or" instead of "else".

Regards,
Nikita

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