Foreach list behaviour View as Markdown

hi,

    Just looking at the foreach list behaviour and it does this...

$i = [1, 2, 3];
foreach($i as list($a, $b))
var_dump($a, $b);

Outputs....

NULL
NULL
NULL
NULL
NULL
NULL

There is no test I can see covering this, so cannot tell if its
expected.

To me, $i does not meet the expected format, so should be some sort of
error happening.

this is expected behavior, like:
<?php
list($a, $b) = 1;
var_dump($a);

Ew, that's quite nasty (in both cases). Is there a way how we could turn
those into a notice or so?
Hi:

yeah, we can trigger a notice if the container is not a array.

but maybe deserve a RFC?

I do not think it is necessary. It is an improvement of this newly
added feature and list.
Hi:
if we fixed this, what about following example:

<?php

$num = NULL;

echo $num["xxx"];

does this also deserve a notice?

thanks

Cheers,

Pierre

@pierrejoye

--
Laruence Xinchen Hui
http://www.laruence.com/

Ew, that's quite nasty (in both cases). Is there a way how we could turn
those into a notice or so?

cheers,
Derick

Sorry, hit reply instead of reply-all...

list($a,$b) = 1;
var_dump($a,$b);
/*
NULL
NULL
*/

This doesn't throw notices anywhere else... why should it throw
notices in foreach? I guess the only logical answer would be to notify
you if you were using scalar values with foreach and list, but then we
don't notify you if you're using scalar values with list anywhere else
in the language anyway. I'm starting to see huge inconsistencies with
how list is being implemented in foreach.

Possibly more importantly, since 1 should cast to, er, [1] (I think...), why
is $a === NULL?

--
Andrew Faulds
http://ajf.me/

It should absolute not cast anything. list($a, $b) = $c; is the
equivalent of saying $a = $c[0]; $b = $c[1]; In this case $c just
happens to be a scalar value and as such you can not derive anything
from the scalar value in that context. It is implicitly null.