From: davelowe at davelowe dot net
Operating system: Windows 2000 Pro
PHP version: 4.3.5
PHP Bug Type: Variables related
Bug description: Variable variable causing undefined variable error
Description:
------------
I have a column value coming back from a mysql query that is
'%$g_userName'
Now, when I look at the column for each row and see a leading '%', I know
that the value is actually the name of a variable that exists in my
application. Here's a code snippet, where $name contains the column's
value as returned by mysql (the value is '%$g_userName'):
if (substr($name, 0, 1) == '%') {
$actualName = substr($name, 1, strlen($name) - 1);
$name = $$actualName;
}
When the code above gets executed, I get the following error:
Notice: Undefined variable: $g_userName in
C:\htdocs\ebbs\scripts\rightMenu_inc.php on line 51
I added the following immediately after the if {...} to make sure
$g_userName actually exists and contains a value:
echo $g_userName.'<br />';
And now I get the following:
Notice: Undefined variable: $g_userName in
C:\htdocs\ebbs\scripts\rightMenu_inc.php on line 51
dave
Where 'dave' is the value I had hard-coded in $g_userName.
Reproduce code:
---------------
$g_userName = 'dave';
$name = '$'.'g_userName';
$trueName = $$name;
echo $trueName;
Expected result:
----------------
dave
Actual result:
--------------
Notice: Undefined variable: $g_userName in
C:\htdocs\ebbs\scripts\pageFooter_inc.php on line 7
--
Edit bug report at http://bugs.php.net/?id=27938&edit=1
--
Try a CVS snapshot (php4): http://bugs.php.net/fix.php?id=27938&r=trysnapshot4
Try a CVS snapshot (php5): http://bugs.php.net/fix.php?id=27938&r=trysnapshot5
Fixed in CVS: http://bugs.php.net/fix.php?id=27938&r=fixedcvs
Fixed in release: http://bugs.php.net/fix.php?id=27938&r=alreadyfixed
Need backtrace: http://bugs.php.net/fix.php?id=27938&r=needtrace
Need Reproduce Script: http://bugs.php.net/fix.php?id=27938&r=needscript
Try newer version: http://bugs.php.net/fix.php?id=27938&r=oldversion
Not developer issue: http://bugs.php.net/fix.php?id=27938&r=support
Expected behavior: http://bugs.php.net/fix.php?id=27938&r=notwrong
Not enough info: http://bugs.php.net/fix.php?id=27938&r=notenoughinfo
Submitted twice: http://bugs.php.net/fix.php?id=27938&r=submittedtwice
register_globals: http://bugs.php.net/fix.php?id=27938&r=globals
PHP 3 support discontinued: http://bugs.php.net/fix.php?id=27938&r=php3
Daylight Savings: http://bugs.php.net/fix.php?id=27938&r=dst
IIS Stability: http://bugs.php.net/fix.php?id=27938&r=isapi
Install GNU Sed: http://bugs.php.net/fix.php?id=27938&r=gnused
Floating point limitations: http://bugs.php.net/fix.php?id=27938&r=float
