From: tomas_matousek at hotmail dot com
Operating system: WinXP
PHP version: 5.1.0RC1
PHP Bug Type: Scripting Engine problem
Bug description: Passing assignment result by reference
Description:
------------
Let's have a function with a parameter passsed by reference.
function f(&$x) { }
Now, call this function as follows:
f($a = $b = $c);
This will sometimes fail sometimes not depending on whether any of the
variables $a, $b, $c has previously been used with =& operator. In a such
case, the call succeeds with $a being aliased to $x. Otherwise, fatal
error occures: "Only variables can be passed by reference".
this code works:
$b =& $z;
f($a = $b = $c);
this code doesn't:
f($a = $b = $c);
So the "correctness" of the code depends on whether there exists an alias
of one of the variable. That's weird, isn't it?
Reproduce code:
---------------
$b =& $z;
f($a = $b = $c);
f($u = $v = $w);
Expected result:
----------------
OK.
OK.
- or -
Error.
Error.
Actual result:
--------------
OK.
Error.
--
Edit bug report at http://bugs.php.net/?id=34795&edit=1
--
Try a CVS snapshot (php4): http://bugs.php.net/fix.php?id=34795&r=trysnapshot4
Try a CVS snapshot (php5.0):
http://bugs.php.net/fix.php?id=34795&r=trysnapshot50
Try a CVS snapshot (php5.1):
http://bugs.php.net/fix.php?id=34795&r=trysnapshot51
Fixed in CVS: http://bugs.php.net/fix.php?id=34795&r=fixedcvs
Fixed in release: http://bugs.php.net/fix.php?id=34795&r=alreadyfixed
Need backtrace: http://bugs.php.net/fix.php?id=34795&r=needtrace
Need Reproduce Script: http://bugs.php.net/fix.php?id=34795&r=needscript
Try newer version: http://bugs.php.net/fix.php?id=34795&r=oldversion
Not developer issue: http://bugs.php.net/fix.php?id=34795&r=support
Expected behavior: http://bugs.php.net/fix.php?id=34795&r=notwrong
Not enough info:
http://bugs.php.net/fix.php?id=34795&r=notenoughinfo
Submitted twice:
http://bugs.php.net/fix.php?id=34795&r=submittedtwice
register_globals: http://bugs.php.net/fix.php?id=34795&r=globals
PHP 3 support discontinued: http://bugs.php.net/fix.php?id=34795&r=php3
Daylight Savings: http://bugs.php.net/fix.php?id=34795&r=dst
IIS Stability: http://bugs.php.net/fix.php?id=34795&r=isapi
Install GNU Sed: http://bugs.php.net/fix.php?id=34795&r=gnused
Floating point limitations: http://bugs.php.net/fix.php?id=34795&r=float
No Zend Extensions: http://bugs.php.net/fix.php?id=34795&r=nozend
MySQL Configuration Error: http://bugs.php.net/fix.php?id=34795&r=mysqlcfg
