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Bug #75743 ${$<superglobal variable>} inside function does not work
Submitted: 2017-12-28 13:31 UTC Modified: 2018-01-02 13:10 UTC
From: works dot devel at gmail dot com Assigned: cmb (profile)
Status: Not a bug Package: Scripting Engine problem
PHP Version: 7.1.12 OS: Ubuntu
Private report: No CVE-ID: None
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 [2017-12-28 13:31 UTC] works dot devel at gmail dot com 
Description:
------------
---
From manual page: http://www.php.net/reserved.variables.get
---

function f() {
    $var = '_GET';
    print_r(${$var});
}
f();


Test script:
---------------
http://localhost/my-script.php?foo=bar

Expected result:
----------------
Array ( foo => bar )

Actual result:
--------------
Notice: Undefined variable: _GET in ...

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 [2017-12-28 13:47 UTC] danack@php.net 
I'm not sure the reason, but this is defined behaviour http://php.net/manual/en/language.variables.superglobals.php: 

Note: Variable variables
Superglobals cannot be used as variable variables inside functions or class methods.
 [2018-01-02 13:10 UTC] cmb@php.net
-Status: Open +Status: Not a bug -Package: Arrays related +Package: Scripting Engine problem -Assigned To: +Assigned To: cmb
 [2018-01-02 13:10 UTC] cmb@php.net 
Since the behavior is documented as such, this is not a bug.

Changing the current behavior would require an RFC.  Feel free to
start the process[1]. :)

[1] <https://wiki.php.net/rfc/howto>
 
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