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In-Reply-To: <9A432898-EB7A-45C9-9C6F-AE6392B9B5C3@newclarity.net>
Date: Mon, 21 Oct 2019 10:11:36 +0700
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To: Mike Schinkel <mike@newclarity.net>
Cc: PHP internals <internals@lists.php.net>
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Subject: Re: [PHP-DEV] 'switch-expression' and the 'type guard' unary operator demo
From: webdevxp.com@gmail.com (Kosit Supanyo)

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Hi Mike


> Ok, so let's look at a scenario. Will we be able to do this in the future,
> if we decide to allow multiple expressions to result in a final value?
> $y = switch ($x) {
>     case 1 => $arr = get_array(), array_pop($arr),
>     case -1 => $arr = get_array(), array_unshift($arr),
>     default => null,
> };


As I told you in previous reply, I'm working on block-expressions as well.
So if PHP has block-expressions you can do the same this way:

$y = switch ($x) {
    case 1 => eval {
        $arr = get_array();
        give array_pop($arr);
    },
    case -1 => eval {
        $arr = get_array();
        give array_shift($arr);
    },
    default => null,
};

Which is obviously cleaner and more powerful.

Are you saying it is literally impossible given the current engine, or just
> that it has not been done with `break`, `continue` or `goto`?


Yes, it is impossible to break out of an ongoing function call without
exceptions.

Your response makes me think you are responding in anger? I am not arguing
> in anger myself, so I hope that I am not causing you to reply in anger? I
> am merely asking posing technical challenges in hopes to ensure that PHP is
> the best it can be.  I assume we all want that?


No, I was not angry. Just a little bit tired. I appologize making you feel
that way.

Regards

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