Bug #63862 [Opn]: Passing by reference: func($a = $b);
Edit report at https://bugs.php.net/bug.php?id=63862&edit=1
ID: 63862
User updated by: bobwei9 at hotmail dot com
Reported by: bobwei9 at hotmail dot com
Summary: Passing by reference: func($a = $b);
Status: Open
Type: Bug
Package: Scripting Engine problem
Operating System: Mac OS X Mountain Lion
PHP Version: master-Git-2012-12-27 (Git)
Block user comment: N
Private report: N
New Comment:
I know how it works now, but I don't know if it is intended (It isn't documented.)
Then I wish that the first variable $a = $b = $c; is passed by array.
Previous Comments:
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[2012-12-31 22:06:57] mail+php at requinix dot net
FYI:
Expected behavior. The "value" of an assignment is just a value and not a
reference to a variable, just like how "true?$a:$b" is the value of $a and not
actually the variable $a.
I don't think it would be so difficult to change that behavior but I'm afraid of
the consequences it might have.
There's also a more subtle change that would be required for your shorthand to
work. Assignment currently propagates the right-most operand: $a=$b=$c is almost
equivalent* to $b=$c;$a=$c; and not $b=$c;$a=$b; Unless that changes as well then
sort($array=[3,1,2]) would try to sort the [3,1,2] and not $array.
* $c is evaluated only once
------------------------------------------------------------------------
[2012-12-27 16:57:06] bobwei9 at hotmail dot com
Description:
------------
I don't know if this should be considered as a bug or as expected behaviour (=> feature
request).
When passing an assignment to a function which expects a variable as reference like sort(), then an
E_STRICT message is issued and nothing has changed.
What I want, is that a code like "sort($a = $b);" is executed in the same way as "$a
= $b; sort($a);".
This could help to reduce the number of little, unnecessary lines.
Test script:
---------------
php -r 'sort($array = [3,1,2]); var_dump($array);'
Expected result:
----------------
array(3) {
[0]=>
int(1)
[1]=>
int(2)
[2]=>
int(3)
}
Actual result:
--------------
Strict Standards: Only variables should be passed by reference in Command line code on line 1
array(3) {
[0]=>
int(3)
[1]=>
int(1)
[2]=>
int(2)
}
------------------------------------------------------------------------
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Edit this bug report at https://bugs.php.net/bug.php?id=63862&edit=1
Thread (3 messages)