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Bug #29702 $a=$GLOBALS works as $a=&$GLOBALS
Submitted: 2004-08-16 11:45 UTC Modified: 2004-08-16 16:34 UTC
From: andrea dot busia at axis-sv dot it Assigned:
Status: Not a bug Package: Scripting Engine problem
PHP Version: 5.0.1 OS: Win / Linux
Private report: No CVE-ID: None
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From: andrea dot busia at axis-sv dot it
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 [2004-08-16 11:45 UTC] andrea dot busia at axis-sv dot it 
Description:
------------
In this script seems that the $GLOBALS value is changed by the unset statement but I want to modify $ar, $GLOBALS must remain the same as before.


Reproduce code:
---------------
<?
$xml=array("aaa", "bbb", "ccc");
foo();

function foo() {
	var_dump($GLOBALS["xml"]);
	$ar=$GLOBALS;
	unset($ar['xml']);
	var_dump($GLOBALS["xml"]);
}
?>

Expected result:
----------------
array(3) {
  [0]=>
  string(3) "aaa"
  [1]=>
  string(3) "bbb"
  [2]=>
  string(3) "ccc"
}
array(3) {
  [0]=>
  string(3) "aaa"
  [1]=>
  string(3) "bbb"
  [2]=>
  string(3) "ccc"
}


Actual result:
--------------
array(3) {
  [0]=>
  string(3) "aaa"
  [1]=>
  string(3) "bbb"
  [2]=>
  string(3) "ccc"
}
NULL

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 [2004-08-16 12:02 UTC] derick@php.net 
Thank you for taking the time to write to us, but this is not
a bug. Please double-check the documentation available at
http://www.php.net/manual/ and the instructions on how to report
a bug at http://bugs.php.net/how-to-report.php

This is a feature.
 [2004-08-16 12:19 UTC] andrea dot busia at axis-sv dot it 
Is it documented? I didn't find this in the manual, probably this is a documentation problem.
 [2004-08-16 12:28 UTC] andrea dot busia at axis-sv dot it 
BTW:
Even if I try to use array_diff_assoc to have a "COPY" of $GLOBALS the script gives me the same result.
I thing this is a very big problem without a "array_copy" function.

I tried:
<?
$xml=array("aaa", "bbb", "ccc");
foo();

function foo() {
	var_dump($GLOBALS["xml"]);
	$ar=array_diff_assoc($GLOBALS, array());
	unset($ar['xml']);
	var_dump($GLOBALS["xml"]);
}
?>
 [2004-08-16 14:33 UTC] derick@php.net 
http://no2.php.net/reserved.variables
read the section on $GLOBALS
 [2004-08-16 14:43 UTC] andrea dot busia at axis-sv dot it 
I see the manual page but I don't see anywhere that I cannot COPY $GLOBALS content to an other variable.

Andrea Busia
 [2004-08-16 14:49 UTC] derick@php.net 
Sorry, but your problem does not imply a bug in PHP itself.  For a
list of more appropriate places to ask for help using PHP, please
visit http://www.php.net/support.php as this bug system is not the
appropriate forum for asking support questions. 

Thank you for your interest in PHP.
 [2004-08-16 16:26 UTC] andrea dot busia at axis-sv dot it 
I'm not asking support, I'm saying that this behaviour isn't written in the documentation and this is a problem!
 [2004-08-16 16:34 UTC] derick@php.net 
It's explained just fine and there is NO bug here, please consult the mailinglists for help (otherwise called "support").
 
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