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Date: Sun, 9 Aug 2020 12:38:03 +0100
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Subject: Re: [PHP-DEV] [RFC] Import of variables
From: rowan.collins@gmail.com (Rowan Tommins)

On 09/08/2020 10:01, Manuel Canga wrote:
> Hi Internals,
>
> I'd like to open up a discussion around the implementation of a new
> functionality: 'import of variables'.
>
> This functionality would allow to create a new  'use vars' keyword in order to can use( or cannot use )  global variables in local scope( of current file ).


Right now, PHP has no notion of "file scope", and making that the 
_default_ would be a huge compatibility break. The "use vars none" 
variant that opts _out_ of the global scope might be possible, but at 
that point, you can just use the common JS trick of wrapping your code 
in a function and immediately running it:

<?php
(function() {
global $a, $c, $d;

echo $a; //1
echo $b; //Warning: undefined var $b
$c = 'a value'; //replace value in global var
})();
  


The last example, where the function uses "global" but only gets the 
globals if they're also "used" in the current file, seems like it would 
make more sense using a class, a static method, and some private static 
variables, since right now we don't think of a function as "belonging 
to" a file in the same way it would belong to a class.


Regards,

-- 
Rowan Tommins (né Collins)
[IMSoP]