Good evening everyone,
I have a simple suggestion for a feature addition, which I have already
implemented. Over 13 years ago, someone suggested adding support for
assigning by reference in list(), with the following syntax:
$arr = [1, 2]
list(&$a, $b) = $arr;
Which would be equivalent to:
$a = &$arr[0];
$b = $arr[2];
Their request is here: https://bugs.php.net/bug.php?id=6768
It seemed like a useful feature, so I implemented it. The syntax is a
little unusual, in that normally you do $a = &$b, and with list() you'd
do list(&$a) = [$b], but I don't think there's a better syntax for it
that allows you to set some variables as references, but not all.
The patch is here:
https://github.com/TazeTSchnitzel/php-src/compare/ListByReference
If people think it is useful, I'll write an RFC soon.
Thanks,
Andrea Faulds
http://ajf.me/
Seems like a natural fit to me.
Does it also work with the new foreach/list combo?
foreach ($array as list(&$a, $b)) {}
--
Matthew Leverton
Good evening everyone,
I have a simple suggestion for a feature addition, which I have already
implemented. Over 13 years ago, someone suggested adding support for
assigning by reference in list(), with the following syntax:$arr = [1, 2] list(&$a, $b) = $arr;Which would be equivalent to:
$a = &$arr[0]; $b = $arr[2];Their request is here: https://bugs.php.net/bug.php?id=6768
It seemed like a useful feature, so I implemented it. The syntax is a little
unusual, in that normally you do $a = &$b, and with list() you'd do
list(&$a) = [$b], but I don't think there's a better syntax for it that
allows you to set some variables as references, but not all.The patch is here:
https://github.com/TazeTSchnitzel/php-src/compare/ListByReferenceIf people think it is useful, I'll write an RFC soon.
Thanks,
Andrea Faulds
http://ajf.me/
Seems like a natural fit to me.
Does it also work with the new foreach/list combo?
foreach ($array as list(&$a, $b)) {}
Somehow I managed to forget to test that. Apparently, it does:
ajf@raspberrypi ~/PHP/php-src $ sapi/cli/php -r '$arr = [[1,2],[3,4]];
foreach ($arr as list(&$a, $b)) $a = 7; var_dump($arr);'
array(2) {
[0]=>
array(2) {
[0]=>
int(7)
[1]=>
int(2)
}
[1]=>
array(2) {
[0]=>
&int(7)
[1]=>
int(4)
}
}
I should probably add a test for this.
Andrea Faulds
http://ajf.me/