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Date: Mon, 8 Apr 2019 11:35:31 +0200
Message-ID: <CAG9XoMQP_=M388=CyPqWmSZjKVv7qDaZP+rn30dQi8AeZCFYUQ@mail.gmail.com>
To: Dan Ackroyd <Danack@basereality.com>
Cc: Guilliam Xavier <guilliam.xavier@gmail.com>, PHP internals <internals@lists.php.net>, 
	David Rodrigues <david.proweb@gmail.com>
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Subject: Re: [PHP-DEV] [RFC] Nullable Casting
From: benjamin.morel@gmail.com (Benjamin Morel)

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> register_cast_function('?int', 'castToIntOrNull');

I would quite oppose such a generic implementation, as it might have
unexpected consequences in other parts of the codebase : it's a global
configuration set at runtime.

I quite like the idea of nullable casting though, as I've come across a few
cases myself where this would have been useful and would have made the code
more concise/readable.

Ben

On Mon, 8 Apr 2019 at 04:55, Dan Ackroyd <Danack@basereality.com> wrote:

> 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
>
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>

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