Re: [RFC] Scalar Type Hinting With Casts (re-opening)

From: Date: Fri, 18 Jul 2014 13:09:49 +0000
Subject: Re: [RFC] Scalar Type Hinting With Casts (re-opening)
References: 1  Groups: php.internals 
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On 18 Jul 2014, at 06:02, Theodore Brown <theodorejb@outlook.com> wrote:

> Another concern I have is in regard to the future. I'm looking forward to the 
> possibility of specifying nullable types in a future version of PHP (see Levi Morrison's
> "Declaring Nullable Types" RFC: http://wiki.php.net/rfc/nullable_typehints).
> If the 
> nullable types RFC is accepted, it would be highly disconcerting if scalar type 
> annotations allowed null values regardless of whether a nullable marker is specified.

The current proposed behaviour could be changed. At the moment, if a scalar type hint is nullable,
then it won’t cast NULL if it’s passed that value, but if it’s not nullable, then it will cast
it.

Considering how this tends to only allow lossless casts, though, it might be worth reconsidering
this and just disallowing NULL altogether. It’s worth pointing out that NULL is usually an error
value, and you might get it from using an uninitialised variable or calling an internal function
with bad parameters.

--
Andrea Faulds
http://ajf.me/

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