Bug #78475 [NEW]: Unsetting or assigning a value to $GLOBALS makes it stop working
From: ayg at aryeh dot name
Operating system:
PHP version: 7.3.9
Package: Scripting Engine problem
Bug Type: Bug
Bug description:Unsetting or assigning a value to $GLOBALS makes it stop working
Description:
------------
$GLOBALS contains a reference to a magical array that has all the
globals in it. Unsetting or assigning a value to it seems to forevermore
lose the reference to this magical array, making $GLOBALS a regular old
variable that has no connection to defined globals (although it's still
a superglobal).
Unsetting or assigning to $GLOBALS probably should fail, just like $this
does. I spent some time today trying to debug a scenario where
$GLOBALS['someVar'] did not equal $someVar after I had written "global
$someVar". It turned out to be because someone had unset $GLOBALS
somewhere (they were trying to clear all global variables and restore
them to an earlier state). This is really confusing and should be
disallowed. Or at least produce a notice or something.
Test script:
---------------
$a = 1;
unset( $GLOBALS );
function f() {
global $a;
unset( $GLOBALS ); // $GLOBALS = []; is the same
var_dump( $a );
var_dump( isset( $GLOBALS['a' ) );
}
f();
Expected result:
----------------
Either:
int(1)
bool(true)
Or:
NULL
bool(false)
Actual result:
--------------
int(1)
bool(false)
--
Edit bug report at https://bugs.php.net/bug.php?id=78475&edit=1
--
Fix committed: https://bugs.php.net/fix.php?id=78475&r=fixed
Fixed in release: https://bugs.php.net/fix.php?id=78475&r=alreadyfixed
Need backtrace: https://bugs.php.net/fix.php?id=78475&r=needtrace
Need Reproduce Script: https://bugs.php.net/fix.php?id=78475&r=needscript
Try newer version: https://bugs.php.net/fix.php?id=78475&r=oldversion
Not developer issue: https://bugs.php.net/fix.php?id=78475&r=support
Expected behavior: https://bugs.php.net/fix.php?id=78475&r=notwrong
Not enough info: https://bugs.php.net/fix.php?id=78475&r=notenoughinfo
Submitted twice: https://bugs.php.net/fix.php?id=78475&r=submittedtwice
register_globals: https://bugs.php.net/fix.php?id=78475&r=globals
PHP version support discontinued: https://bugs.php.net/fix.php?id=78475&r=phptooold
Daylight Savings: https://bugs.php.net/fix.php?id=78475&r=dst
IIS Stability: https://bugs.php.net/fix.php?id=78475&r=isapi
Install GNU Sed: https://bugs.php.net/fix.php?id=78475&r=gnused
Floating point limitations: https://bugs.php.net/fix.php?id=78475&r=float
No Zend Extensions: https://bugs.php.net/fix.php?id=78475&r=nozend
MySQL Configuration Error: https://bugs.php.net/fix.php?id=78475&r=mysqlcfg
Thread (4 messages)
- ayg at aryeh dot name