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Date: Mon, 8 Apr 2019 17:41:22 +0200
Cc: Benjamin Morel <benjamin.morel@gmail.com>,
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 PHP internals <internals@lists.php.net>,
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To: Stephen Reay <php-lists@koalephant.com>
Subject: Re: [PHP-DEV] [RFC] Nullable Casting
From: claude.pache@gmail.com (Claude Pache)



> Le 8 avr. 2019 =C3=A0 12:24, Stephen Reay <php-lists@koalephant.com> a =
=C3=A9crit :
>=20
> if your target =E2=80=99type=E2=80=99 is `?int` and you pass an empty =
string, wouldn=E2=80=99t you expect to get `null` rather than `0` ?=20


You should get the same value than you get in:

```php
declare(strict_types=3D0);

function foo(?int $x) {
    return $x;
}

foo("");
```

BTW, this is an argument to the have nullable casting functionality in =
core, rather than leave each developer to craft their own solution. =
Because PHP does already such nullable castings in several occasions =
(typed parameters, typed return values, and soon typed class properties, =
when you are in strict_types=3D0 mode), we should offer the programmers =
a built-in evident way to do the same type of casting, with the same =
semantics in occasion they want to do it manually. Otherwise, one =
developer will decide to map the empty string to null, the other to 0 =
and the third to NAN, and they get problems when they refactor the code =
in a way that a manual casting is replaced by an automatic implicit =
casting or vice versa, and the semantics differs on some cases.

=E2=80=94Claude=