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Subject: Re: [PHP-DEV] Using Superglobals for variable variables works
From: michael.virnstein@brodos.de (Michael Virnstein)

ok, sorry, now i have it. i read the german manual version first and 
that says that you can't use what i said. The german is wrong and the 
english version of the manual has it right. It says:
"Please note that variable variables cannot be used with PHP's 
Superglobal arrays  within functions or class methods."

i tested it and it is true, you can't used it inside functions, because 
the variable would not reference to the superglobal variable this way.

<?php
function test() {
    $a = '_GET';
    var_dump($$a); // $$a has no reference to the superglobal $_GET
}

test();
?>

the output is

NULL

Anyway, thanks for your time. ;)

Regards, Michael


Michael Virnstein wrote:
> but this does also work, atm. i'm using PHP 5.0.2 on Windows XP with 
> apache 1.3 and if i call my php page with 
> http://localhost/test.php?test=works it works.
> 
> //test.php
> <?php
> 
> $a = '_GET';
> 
> echo ${$a}['test'];
> 
> var_dump($$a);
> 
> ?>
> 
> the output is:
> 
> works
> array(1) {
>   ["test"]=>
>   string(5) "works"
> }
> 
> Andi Gutmans wrote:
> 
>> The idea is that the following doesn't work by design:
>> $a = "_GET";
>> var_dump($$a);
>>
>> At 11:31 PM 1/28/2005 +0100, Michael Virnstein wrote:
>>
>>> Hi PHP-Devs,
>>>
>>> i don't know if it is a bug or a new feature of php5. The php manual 
>>> says, that using superglobals for variable variables isn't working, 
>>> so something like this shouldn't work:
>>>
>>> <?php
>>>
>>> $a = 'hello world';
>>>
>>> echo ${$_GET['test']};
>>>
>>> ?>
>>>
>>> Actually it does work. Is this intended now? Would be nice, but if it 
>>> is a simple bug and i can't rely on it to work in the future, i won't 
>>> use it. Hope it is a feature though. ;)
>>>
>>> Regards, Michael
>>>
>>> -- 
>>> PHP Internals - PHP Runtime Development Mailing List
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