Re: PHP7 / foreach / references / ugly code / discrepancy to PHP 5.6

Here’s a 3v4l demonstrating this too: https://3v4l.org/OXAd3 <https://3v4l.org/OXAd3> > On Nov 10, 2015, at 8:48 AM, Philip Hofstetter <phofstetter@sensational.ch> wrote: > > Hi, > > I'm having a cause of slightly ugly code that runs differently from PHP 5.6 > to PHP 7 and I don't think this difference is documented, nor expected. As > I'm not sure whether this is an intended change or not, I'm asking here > firstr before making a bug report. > > The code in question is > > ---- > $b = [1, 2, 3]; > > foreach($b ?: [] as &$v){ > $v = $v*2; > unset($v); > } > > var_dump($b); > ---- > in PHP7, this produces > > array(3) { > [0] => > int(1) > [1] => > int(2) > [2] => > int(3) > } > > whereas in PHP 5.6 and earlier, this produces > > array(3) { > [0] => > int(2) > [1] => > int(4) > [2] => > int(6) > } > > what scares me about this is that in order to get the old behaviour in PHP7 > back, you just have to get rid of the ?: operator: > > foreach($b as &$v){ > > is fine > > foreach($b ?: [] as &$v){ > > is not. > > I guess this is related to > > http://php.net/manual/en/migration70.incompatible.php#migration70.incompatible.foreach.by-value > or > > http://php.net/manual/en/migration70.incompatible.php#migration70.incompatible.foreach.by-ref, > but I'm not entirely sure whether this is actually intended behaviour - > it's certainly unexpected to me that applying ?: now always makes a copy > whereas before it didn't. > > Philip > > > > -- > Sensational AG > Giesshübelstrasse 62c, Postfach 1966, 8021 Zürich > Tel. +41 43 544 09 60, Mobile +41 79 341 01 99 > info@sensational.ch, http://www.sensational.ch