Doc #51112 [Opn->Csd]: list() misbehaviour

Edit report at https://bugs.php.net/bug.php?id=51112&edit=1 ID: 51112 Updated by: nikic@php.net Reported by: post at oliver-schieche dot de Summary: list() misbehaviour -Status: Open +Status: Closed Type: Documentation Problem Package: Documentation problem Operating System: Debian (etch) PHP Version: 5.2.12 -Assigned To: +Assigned To: nikic Block user comment: N Private report: N New Comment: This bug has been fixed in the documentation's XML sources. Since the online and downloadable versions of the documentation need some time to get updated, we would like to ask you to be a bit patient. Thank you for the report, and for helping us make our documentation better. Previous Comments: ------------------------------------------------------------------------ [2011-12-08 21:25:26] nikic@php.net Automatic comment from SVN on behalf of nikic Revision: http://svn.php.net/viewvc/?view=revision&revision=320698 Log: Fix Doc Bug #51112: list() misbehaviour Add a warning saying that modification of the array being destructured during list() execution will result in undefined behavior. ------------------------------------------------------------------------ [2010-03-22 12:00:16] rasmus@php.net Like Johannes said and Pierre said, writing to a variable you are iterating over gives undefined behaviour. That means it will work in some cases and not in others and may very well change between versions. There is nothing to fix here except perhaps a little note in the documentation. ------------------------------------------------------------------------ [2010-03-22 01:00:29] post at oliver-schieche dot de Hate to be nagging again, but there's still a problem: it works "as it's supposed to" (read: "as it's not documented") in PHP4, but doesn't in PHP5 with the exception, that the following produces expected results: $a = array('Foo','Bar'); list($a,$b) = $a; $a == 'Foo' ==> TRUE $b == 'Bar' ==> TRUE "both variables are needed during the "list" operation." is a somewhat confusing statement regarding the issue(s) above. ------------------------------------------------------------------------ [2010-03-21 19:52:00] johannes@php.net The order in which the variables are picked up in this case is "undefined behavior" - both variables are needed during the "list" operation. ------------------------------------------------------------------------ [2010-03-18 18:38:12] kalle@php.net Can this either be classfied as a scripting engine bug. If it indeed is a documentation issue then re-classify this as a "To be Documented" documentation issue for the developer that picks this one up. ------------------------------------------------------------------------ The remainder of the comments for this report are too long. To view the rest of the comments, please view the bug report online at https://bugs.php.net/bug.php?id=51112 -- Edit this bug report at https://bugs.php.net/bug.php?id=51112&edit=1