# Foreach list behaviour - Thread: https://externals.io/message/62697 - Original archive: https://news-web.php.net/php.internals/62697 - Started by Jared Williams on 2012-09-02T23:07:49+00:00 - Messages: 11 - Reply by email to internals@lists.php.net - More for agents: search with https://externals.io/search.md?q={query} · JSON API at https://externals.io/api · documentation at https://externals.io/llms.txt --- ## #62697 — Jared Williams — 2012-09-02T23:07:49+00:00 URL: https://externals.io/message/62697#62697 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. Jared --- ## #62702 — Laruence — 2012-09-03T02:43:11+00:00 URL: https://externals.io/message/62697#62702 · In reply to: #62697 Hi: this is expected behavior, like: wrote: > 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, $i does not meet the expected format, so should be some sort of > error happening. > > Jared > > > -- > > > -- Laruence Xinchen Hui http://www.laruence.com/ --- ## #62711 — Derick Rethans — 2012-09-03T08:20:01+00:00 URL: https://externals.io/message/62697#62711 · In reply to: #62702 > > > […] > > this is expected behavior, like: > list($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? cheers, Derick -- http://derickrethans.nl | http://xdebug.org Like Xdebug? Consider a donation: http://xdebug.org/donate.php twitter: @derickr and @xdebug Posted with an email client that doesn't mangle email: alpine --- ## #62712 — Laruence — 2012-09-03T08:36:36+00:00 URL: https://externals.io/message/62697#62712 · In reply to: #62711 > > > > […] > > 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? thanks > > cheers, > Derick > > -- > http://derickrethans.nl | http://xdebug.org > Like Xdebug? Consider a donation: http://xdebug.org/donate.php > twitter: @derickr and @xdebug > Posted with an email client that doesn't mangle email: alpine -- Laruence Xinchen Hui http://www.laruence.com/ --- ## #62714 — Pierre Joye — 2012-09-03T09:28:19+00:00 URL: https://externals.io/message/62697#62714 · In reply to: #62712 hi, > > > […] > 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. Cheers, -- Pierre @pierrejoye --- ## #62716 — Laruence — 2012-09-03T09:35:32+00:00 URL: https://externals.io/message/62697#62716 · In reply to: #62714 > hi, > > > > […] > > 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: > Cheers, > -- > Pierre > > @pierrejoye -- Laruence Xinchen Hui http://www.laruence.com/ --- ## #62730 — Andrew Faulds — 2012-09-03T12:02:19+00:00 URL: https://externals.io/message/62697#62730 · In reply to: #62716 Laruence wrote: >Hi: > if we fixed this, what about following example: > > >$num = NULL; > >echo $num["xxx"]; > > > does this also deserve a notice? > >thanks No because `NULL` is just the first element in implicit array conversion > > > >-- >Laruence Xinchen Hui >http://www.laruence.com/ > >-- > > -- Sent from my Android phone with K-9 Mail. Andrew Faulds http://ajf.me/ --- ## #62758 — Sherif Ramadan — 2012-09-03T17:35:38+00:00 URL: https://externals.io/message/62697#62758 · In reply to: #62711 > > Ew, that's quite nasty (in both cases). Is there a way how we could turn > those into a notice or so? > > cheers, > Derick > Sorry, hit reply instead of reply-all... list($a,$b) = 1; var_dump($a,$b); /* `NULL` `NULL` */ This doesn't throw notices anywhere else... why should it throw notices in foreach? I guess the only logical answer would be to notify you if you were using scalar values with foreach and list, but then we don't notify you if you're using scalar values with list anywhere else in the language anyway. I'm starting to see huge inconsistencies with how list is being implemented in foreach. --- ## #62759 — Andrew Faulds — 2012-09-03T17:36:52+00:00 URL: https://externals.io/message/62697#62759 · In reply to: #62758 > > > […] > Sorry, hit reply instead of reply-all... > > list($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/ --- ## #62760 — Sherif Ramadan — 2012-09-03T17:46:32+00:00 URL: https://externals.io/message/62697#62760 · In reply to: #62759 > > > […] > 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 $c just happens to be a scalar value and as such you can not derive anything from the scalar value in that context. It is implicitly null. --- ## #62761 — Andrew Faulds — 2012-09-03T17:50:45+00:00 URL: https://externals.io/message/62697#62761 · In reply to: #62760 > > It should absolute not cast anything. list($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. Ah, I guess I'm confusing GML and PHP array semantics, somehow... my bad. -- Andrew Faulds http://ajf.me/