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
