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
--
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Giesshübelstrasse 62c, Postfach 1966, 8021 Zürich
Tel. +41 43 544 09 60, Mobile +41 79 341 01 99
[email protected], http://www.sensational.ch
