Re: [RFC][Under Discussion] Add functions array_key_first()and array_key_last()

On Wed, Jun 20, 2018 at 8:09 AM Rowan Collins <rowan.collins@gmail.com> wrote: > > On 20 June 2018 at 14:55, Levi Morrison <levim@php.net> wrote: >> >> >> if ([$key, $value] = array_last($input) { >> // do something >> } >> > > > Unfortunately, this won't work. I didn't know list() could even be used as an > expression, but apparently if it is, it evaluates to the whole array on its right-hand side, which > makes sense. > > So, if array_last([]) returns [null, null], then [$key, $value]=array_last([]) will also > evaluate to [null, null]. Since that's not an empty array (it has two elements in it), it will > evaluate to true. https://3v4l.org/lIEa1 > > If, on the other hand, array_last([]) returned something empty, like [], the list() assignment > would throw Notices for the implicit access to elements [0] and [1] of the empty array. > https://3v4l.org/qhq5R It returns ?array. So either null or [$key, $value]. There are no notices; sorry for the lack of detail.