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Date: Mon, 8 Apr 2019 03:54:44 +0100
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To: Guilliam Xavier <guilliam.xavier@gmail.com>
Cc: PHP internals <internals@lists.php.net>, David Rodrigues <david.proweb@gmail.com>
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Subject: Re: [PHP-DEV] [RFC] Nullable Casting
From: Danack@basereality.com (Dan Ackroyd)

On Sat, 6 Apr 2019 at 08:53, Guilliam Xavier <guilliam.xavier@gmail.com> wrote:
>
> Hello internals,
>
> David and I would like to open the discussion on our joint RFC:
>
> https://wiki.php.net/rfc/nullable-casting
>
> Mainly, it would enable to use e.g. `(?int)$x` besides `(int)$x`.
>

I'm guessing you don't actually have ths function getIntOrNull() in
your code-base? To help me understand where this would be useful,
could you provide some 'real-world' code where this would be useful?

By the way, this RFC is a special case of something that could be far
more generic. If it was possible to register callbacks to be used when
casting, people could do something like this:

function castToIntOrNull($value)
{
    if ($value === null) {
        return null;
    }

    return (int)$int;
}

register_cast_function('?int', 'castToIntOrNull');

$x = (?int)getIntOrNull();


> Additionally, it was requested on the mailing list to consider adding
> support of nullable types to the settype() function,
> e.g. settype($variable, "?int")

Someone probably needs to make an argument for it to be in core,
rather than just saying that it's something that could be done.

cheers
Dan
Ack