Edit report at http://bugs.php.net/bug.php?id=51112&edit=1
ID: 51112
Updated by: ras...@php.net
Reported by: post at oliver-schieche dot de
Summary: list() misbehaviour
Status: To be documented
Type: Bug
Package: Scripting Engine problem
Operating System: Debian (etch)
PHP Version: 5.2.12
New Comment:
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.
Previous Comments:
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[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
$b == 'Bar' ==> TRUE
"both variables are needed during the "list" operation." is a somewhat
confusing statement regarding the issue(s) above.
------------------------------------------------------------------------
[2010-03-21 19:52:00] johan...@php.net
The order in which the variables are picked up in this case is
"undefined behavior" - both variables are needed during the "list"
operation.
------------------------------------------------------------------------
[2010-03-18 18:38:12] ka...@php.net
Can this either be classfied as a scripting engine bug. If it indeed is
a documentation issue then re-classify this as a "To be Documented"
documentation issue for the developer that picks this one up.
------------------------------------------------------------------------
[2010-02-22 12:58:56] post at oliver-schieche dot de
Why document an obvious bug instead of fixing it? How would you
document/explain this?
If this works:
function ret($array) {return $array;}
$b = array('foo','bar');
list($a,$b) = ret($b);
But this doesn't:
function &ret(&$array) {return $array;}
$b = array('foo','bar');
list($a,$b) = ret($b);
Then there's a referencing error hidden somewhere...
------------------------------------------------------------------------
[2010-02-22 12:42:52] paj...@php.net
That's pretty much the same thing you can see with foreach, the array
should not be altered while looping (the array itself, the data of a
given element can be altered). No bug here, but should be documented.
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the rest of the comments, please view the bug report online at
http://bugs.php.net/bug.php?id=51112
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