#32745 [NEW]: Incorrect reassignemeent of $this error

From: jason at amp-design dot net Operating system: CentOS 3 / RHEL 3 PHP version: 5CVS-2005-04-18 (dev) PHP Bug Type: Zend Engine 2 problem Bug description: Incorrect reassignemeent of $this error Description: ------------ An incorrect message about the reassignment of $this occurs in the 5.1.x branches of PHP. The code below doesn't product any errors... <?php class A {} $a = new A; $b = &$a; ?> but the "Reproduce code" produces an error when you are inside class scope, trying to use the & operator to create a reference to $this. Obviously the code $b = $this; does the exact same thing in PHP5, however this is a problem as existing code (especially stuff written for PHP4 and PHP5) will break. This is certainly the case here as this bug arises in functions/imap_mailbox.php on line 25 of squirrel mail. Please note this was tested using the php5-200504121430 build which is a couple of days old now. I'm pretty sure it will remain in the latest snapshot. I have no idea why this comes up with the "reassigment of $this" error. I would have thought this error would happen if the expression was reversed to say $this = &$b. Reproduce code: --------------- <?php class A { public function test() { $b = &$this; } } $a = new A; $a->test(); ?> Expected result: ---------------- No output. $a is created and $b === $a during the scope of A::test() for the given code above. Actual result: -------------- Fatal error: Cannot re-assign $this in /var/www/html/test.php on line 4 -- Edit bug report at http://bugs.php.net/?id=32745&edit=1 -- Try a CVS snapshot (php4): http://bugs.php.net/fix.php?id=32745&r=trysnapshot4 Try a CVS snapshot (php5.0): http://bugs.php.net/fix.php?id=32745&r=trysnapshot50 Try a CVS snapshot (php5.1): http://bugs.php.net/fix.php?id=32745&r=trysnapshot51 Fixed in CVS: http://bugs.php.net/fix.php?id=32745&r=fixedcvs Fixed in release: http://bugs.php.net/fix.php?id=32745&r=alreadyfixed Need backtrace: http://bugs.php.net/fix.php?id=32745&r=needtrace Need Reproduce Script: http://bugs.php.net/fix.php?id=32745&r=needscript Try newer version: http://bugs.php.net/fix.php?id=32745&r=oldversion Not developer issue: http://bugs.php.net/fix.php?id=32745&r=support Expected behavior: http://bugs.php.net/fix.php?id=32745&r=notwrong Not enough info: http://bugs.php.net/fix.php?id=32745&r=notenoughinfo Submitted twice: http://bugs.php.net/fix.php?id=32745&r=submittedtwice register_globals: http://bugs.php.net/fix.php?id=32745&r=globals PHP 3 support discontinued: http://bugs.php.net/fix.php?id=32745&r=php3 Daylight Savings: http://bugs.php.net/fix.php?id=32745&r=dst IIS Stability: http://bugs.php.net/fix.php?id=32745&r=isapi Install GNU Sed: http://bugs.php.net/fix.php?id=32745&r=gnused Floating point limitations: http://bugs.php.net/fix.php?id=32745&r=float No Zend Extensions: http://bugs.php.net/fix.php?id=32745&r=nozend MySQL Configuration Error: http://bugs.php.net/fix.php?id=32745&r=mysqlcfg