#34795 [Opn->Fbk]: Passing assignment result by reference

ID: 34795 Updated by: sniper@php.net Reported By: tomas_matousek at hotmail dot com -Status: Open +Status: Feedback Bug Type: Scripting Engine problem Operating System: WinXP PHP Version: 5.1.0RC1 New Comment: Please try using this CVS snapshot: http://snaps.php.net/php5-latest.tar.gz For Windows: http://snaps.php.net/win32/php5-win32-latest.zip Previous Comments: ------------------------------------------------------------------------ [2005-10-09 20:58:39] tomas_matousek at hotmail dot com 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 this bug report at http://bugs.php.net/?id=34795&edit=1