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Date: Wed, 25 Feb 2015 15:42:11 +0400
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Subject: Re: [PHP-DEV] Re: [RFC-Discuss] Scalar Type Declarations v0.5
From: inefedor@gmail.com ("Niktia Nefedov")

On Wed, 25 Feb 2015 16:30:32 +0400, Dmitry Stogov <dmitry@zend.com> wrote:

> anyone may tell, what this will print without running :)
>
> main.php
> ========
> <?php
> declare(strict_types=1)
> include "a.php";
> include "b.php";
> var_dump(foo("5"));
> ?>
>
> a.php
> =====
> <?php
> declare(strict_types=0)
> function foo(string $a): string {
>     bar($a);
>     return $a;
> }
> ?>
>
> b.php
> =====
> <?php
> declare(strict_types=1)
> function bar(int &$a) {
>     var_dump($a);
> }
> ?>
>
> Thank. Dmitry.


Hi Dmitry,

This will error out because $a in the scope of `foo` will be coerced to  
int type when passed to bar by reference.

References are a problem for weak-only types as well (even more so I would  
say, because in a lot of cases they would continue working truncated or  
changed).

Happily there are not lots of post-php5 code that uses references here and  
there, but that would be good to add the point about them to both RFCs  
(and in documentation in future) just so that users would be aware of that.