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Bug #33591 Reference-Flags not resetted
Submitted: 2005-07-06 16:48 UTC Modified: 2005-07-21 11:09 UTC
From: nobody at somewhere dot de Assigned:
Status: Not a bug Package: Scripting Engine problem
PHP Version: 4.3.11 OS: Linux
Private report: No CVE-ID: None
View Developer Edit
 [2005-07-06 16:48 UTC] nobody at somewhere dot de 
Description:
------------
I don't know about any php-Interna

Somehow a PHP-Variable seems to have a Flag that means "Is a Reference". This Flag is not resetted under the conditions I show in the code below.

Cheers!


Reproduce code:
---------------
#---

global $ar;
$ar= array("[element of ar]");
var_dump($ar);

$ok= f();
$ok[0]= "[i DIDN'T set ar!]";
var_dump($ar);

$bug= & f();
$bug= f(); # bug! doesn't reset reference-flag
$bug[0]= "[i DIDN'T set ar!]";
var_dump($ar);

function & f() {
    global $ar;
    return $ar;
}

exit;

#---

Expected result:
----------------
array(1) { [0]=>  string(15) "[element of ar]" }
array(1) { [0]=>  string(15) "[element of ar]" }
array(1) { [0]=>  string(15) "[element of ar]" }


Actual result:
--------------
array(1) { [0]=>  string(15) "[element of ar]" }
array(1) { [0]=>  string(15) "[element of ar]" }
array(1) { [0]=>  string(18) "[i DIDN'T set ar!]" }

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 [2005-07-06 16:57 UTC] derick@php.net 
Please try using this CVS snapshot:

  http://snaps.php.net/php4-STABLE-latest.tar.gz
 
For Windows:
 
  http://snaps.php.net/win32/php4-win32-STABLE-latest.zip
 [2005-07-14 01:00 UTC] php-bugs at lists dot php dot net 
No feedback was provided for this bug for over a week, so it is
being suspended automatically. If you are able to provide the
information that was originally requested, please do so and change
the status of the bug back to "Open".
 [2005-07-21 10:58 UTC] sl at yes-co dot nl 
Output on PHP 5.1.0-dev (Jul 21 2005 08:29:50):

array(1) {
  [0]=>
  string(15) "[element of ar]"
}
array(1) {
  [0]=>
  string(15) "[element of ar]"
}
array(1) {
  [0]=>
  string(18) "[i DIDN'T set ar!]"
}
 [2005-07-21 11:09 UTC] tony2001@php.net 
line 1: $bug= & f();
line 2: $bug= f();
line 3: $bug[0]= "[i DIDN'T set ar!]";

on line 1 you're turning $bug to a reference to $ar.
on line 2 you're setting the value of the referenced variable.
on line 3 you're changing the value of $bug (which is still referencing $ar, so $ar gets changed too).

Adding unset($bug) between 1-st & 2-nd lines resolves it, because in this case unset() kills the reference.

No bug here.
 
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