Hi,
On Tue, Jan 28, 2014 at 10:51 AM, Yasuo Ohgaki <[email protected]> wrote:
> Hi Tjerk,
>
> On Tue, Jan 28, 2014 at 10:39 AM, Tjerk Meesters <[email protected]
> > wrote:
>
>> I still have an RFC lying around that suggests this, together with some
>> other changes to how increment / decrement works. Perhaps we could flesh
>> this out further?
>>
>> https://wiki.php.net/rfc/normalize_inc_dec
>>
>
> The following behaviour is proposed:
>
> // booleans
> $a = false; ++$a; // bool(true)
> $a = true; --$a; // bool(false)
>
> // null values
> $a = null; --$a; // null
> $a = null; ++$a; // null
>
> // empty strings
> $a = ''; ++$a; // int(1)
>
> // non-numeric strings
> $a = '12d9';
> ++$a; // string(4) "12e0" + Notice: String increment is deprecated, use
> str_inc() instead in php shell code on line 1
> ++$a; // float(13)
>
> +1 especially boolean++/--.
> It's great for flip flop. I guess most users use int++ and int%2 for flip
> flop currently.
> Existing scripts using ++/-- against bool would be a bug most likely.
>
The RFC doesn't mention this, but the intended behaviour is that `$a =
true; ++$a; yields bool(true)`, i.e. no overflow ... however, I'm open to
the suggestion to make it "overflowable", like integer values.
Btw, doing flip/flop can be done with $val = (bool)1 - $val; as well :)
>
> Other proposal sounds reasonable to me, too.
>
> Regards,
>
> --
> Yasuo Ohgaki
> [email protected]
>
--
--
Tjerk