Re: Lexical scoping

From: Date: Tue, 28 Jan 2014 16:07:57 +0000
Subject: Re: Lexical scoping
References: 1 2 3 4  Groups: php.internals 
Request: Send a blank email to [email protected] to get a copy of this message 


On 28/01/14 13:36, George Bond wrote:

Alternatively, you could say that the ultimate problem is that we don't
have strong scoping - braces only define flow control, not scope.  So you
could introduce a strong-scoping structure.  Maybe a double brace?

foreach( $array as &$a ){{

     $a = 3;

}}
var_dump( $a ); // E_NOTICE, $a is now undefined

You could even say that an isolated brace pair (ie not one following a
control statement) *always* produces a scope.


My proposal is to add optional strong scoping. As JavaScript has var for function-scoped variables and ECMAScript Harmony will add let for lexically-scoped variables, I'm proposing something similar here. It would allow you to scope to the block, if you so desire.

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

Thread (11 messages)

« previous php.internals (#71676) next »