Edit report at https://bugs.php.net/bug.php?id=64693&edit=1
ID: 64693
User updated by: jdoane at vlacs dot org
Reported by: jdoane at vlacs dot org
-Summary: Third argument passed to array_reduce turned into
return value
+Summary: Third argument ($initial) passed to array_reduce
should be immutable.
Status: Open
Type: Bug
Package: Arrays related
Operating System: Ubuntu 12.04.02 LTS
PHP Version: 5.3.24
Block user comment: N
Private report: N
New Comment:
The order of the expected output is backwards, I apologize.
It should be:
~$ php test.php
stdClass Object
(
[count] => 2
[maxlen] => 5
)
stdClass Object
(
[count] => 0
[maxlen] => 0
)
Previous Comments:
------------------------------------------------------------------------
[2013-04-22 19:41:14] jdoane at vlacs dot org
Description:
------------
When array_reduce is called with an object as the third argument, the variable
passed to said third argument will turn into the result of the array_reduce()
call. It feels like the object getting passed into array_reduce is not being
cloned and is being modified in place. Since all objects are passed as a
reference
it changes the "$initial" variable in the scope where array_reduce was called.
So either documentation needs to be updated that says that $initial gets set to
the return value when it is an object or this shouldn't happen to begin with as
it
appears that $initial should remain immutable for the duration of the
array_reduce() call.
Test script:
---------------
$array = (object)Array('foo', 'baraz');
$initial = (object)Array('count' => 0, 'maxlen' => 0);
$output = array_reduce($array, function(&$d, $item) {
if($d->maxlen < strlen($d)) { $d->maxlen = strlen($d); }
$d->count++;
return $d;
}
print_r($output);
print_r($initial);
Expected result:
----------------
~$ php test.php
stdClass Object
(
[count] => 0
[maxlen] => 0
)
stdClass Object
(
[count] => 2
[maxlen] => 5
)
Actual result:
--------------
~$ php test.php
stdClass Object
(
[count] => 2
[maxlen] => 5
)
stdClass Object
(
[count] => 2
[maxlen] => 5
)
------------------------------------------------------------------------
--
Edit this bug report at https://bugs.php.net/bug.php?id=64693&edit=1
