From: declan at context dot ie
Operating system: linux
PHP version: Irrelevant
PHP Bug Type: Arrays related
Bug description: global $$formvar fails if $formvar == "array[element]"
Description:
------------
If you pass a variable name to a function and then try to dereference that
variable name for use in a global statement, then the global statement
fails.
I believe the problem lies in the way that global is implemented. If I
have the following:
$ary[foo]="bar";
function use_global($varname) {
global $$varname;
echo "$varname is set to ". $$varname;
}
use_global ("ary[foo]");
then I think that the global line is being re-written to be equivalent to
something like:
$_use_global_varname=&$GLOBALS["ary[foo]"];
whereas, AFAICS, it should be:
$_use_global_varname=&$GLOBALS["ary"]["foo"];
I want to be able to use this construct without having to know whether the
incoming variable is a plain variable or an array element.
Reproduce code:
---------------
<?php // -*-php-*-
function use_global ($formvar)
{
$ref=&$GLOBALS[$formvar];
echo "formvar: $formvar = " . $$ref;
};
$global=array ();
$global["foo"]=1;
$global["bar"]=2;
$global["baz"]=3;
echo "global[bar]=$global[bar]\n";
use_global("global[bar]");
?>
Expected result:
----------------
If things worked correctly, the output should be:
global[bar]=2
formvar: global[bar] =2
Actual result:
--------------
global[bar]=2
formvar: global[bar] =
--
Edit bug report at http://bugs.php.net/?id=25692&edit=1
--
Try a CVS snapshot (php4): http://bugs.php.net/fix.php?id=25692&r=trysnapshot4
Try a CVS snapshot (php5): http://bugs.php.net/fix.php?id=25692&r=trysnapshot5
Fixed in CVS: http://bugs.php.net/fix.php?id=25692&r=fixedcvs
Fixed in release: http://bugs.php.net/fix.php?id=25692&r=alreadyfixed
Need backtrace: http://bugs.php.net/fix.php?id=25692&r=needtrace
Try newer version: http://bugs.php.net/fix.php?id=25692&r=oldversion
Not developer issue: http://bugs.php.net/fix.php?id=25692&r=support
Expected behavior: http://bugs.php.net/fix.php?id=25692&r=notwrong
Not enough info: http://bugs.php.net/fix.php?id=25692&r=notenoughinfo
Submitted twice: http://bugs.php.net/fix.php?id=25692&r=submittedtwice
register_globals: http://bugs.php.net/fix.php?id=25692&r=globals
PHP 3 support discontinued: http://bugs.php.net/fix.php?id=25692&r=php3
Daylight Savings: http://bugs.php.net/fix.php?id=25692&r=dst
IIS Stability: http://bugs.php.net/fix.php?id=25692&r=isapi
Install GNU Sed: http://bugs.php.net/fix.php?id=25692&r=gnused
Floating point limitations: http://bugs.php.net/fix.php?id=25692&r=float
