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Date: Mon, 21 Jan 2013 23:59:52 +0100
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To: Crypto Compress <cryptocompress@googlemail.com>
Cc: PHP internals <internals@lists.php.net>
Content-Type: multipart/alternative; boundary=f46d04083e33440c8704d3d46b01
Subject: Re: [PHP-DEV] [VOTE] Alternative typehinting syntax for accessors
From: nikita.ppv@gmail.com (Nikita Popov)

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On Mon, Jan 21, 2013 at 11:54 PM, Crypto Compress <
cryptocompress@googlemail.com> wrote:

> Hello Nikita,
>
> for me this "maybe-of-type"-typehinting is a small progression in the right
> direction.
>
> But "Default values and nullability" would break existing code as you need
> to add a default null at "design-time" (BC break):
>
> <?php
> class C {
>     public $a; // public string $a = null;
>     public $b; // public string $b = null;
>     public function __construct($a, $b) {
>         $this->a = $a;
>         $this->b = $b;
>     }
> }
>
> // test only a
> $c = new C("foo", null);
> var_dump($c->a === "foo");
>
> // test only b
> $c = new C(null, "foo");
> var_dump($c->b === "foo");
> ?>
>
> http://3v4l.org/4oi9k
>
> cryptocompress
>

Sorry if it wasn't clear: The nullability stuff only applies if a typehint
is used. If no typehint is used, then you can freely assign null,
regardless of whether or not you have the "= null" in the declaration (no
typehint = everything's valid). "public $foo;" will continue to behave
exactly the same way it did before :)

Nikita

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