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Bug #70250 extract() turns array elements to references
Submitted: 2015-08-12 16:58 UTC Modified: 2015-08-12 17:02 UTC
Votes:1
Avg. Score:3.0 ± 0.0
Reproduced:1 of 1 (100.0%)
Same Version:1 (100.0%)
Same OS:1 (100.0%)
From: bugs dot php dot net at ss dot st dot tc Assigned:
Status: Closed Package: Arrays related
PHP Version: 7.0Git-2015-08-12 (Git) OS: Gentoo Linux
Private report: No CVE-ID:
 [2015-08-12 16:58 UTC] bugs dot php dot net at ss dot st dot tc
Description:
------------
extract() turns array elements back to references after they were once referenced and despite the reference was removed.
Tested on PHP 5.6.12 (works as expected), 7.0b3 (buggy) and git rev 2366a070c8 (buggy).


Test script:
---------------
<?php

$array = ['key' => 'value'];

// create a reference to an element of the array
$ref = & $array['key'];

// make sure array element is a reference
var_dump($array);

// remove the $ref reference
unset($ref);

// make sure array elements are no longer references
var_dump($array);

extract($array);

// make sure array elements are still no references
var_dump($array);


Expected result:
----------------
array(1) {
  ["key"]=>
  &string(5) "value"
}
array(1) {
  ["key"]=>
  string(5) "value"
}
array(1) {
  ["key"]=>
  string(5) "value"
}


Actual result:
--------------
array(1) {
  ["key"]=>
  &string(5) "value"
}
array(1) {
  ["key"]=>
  string(5) "value"
}
array(1) {
  ["key"]=>
  &string(5) "value"   <=== reference again
}


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History

AllCommentsChangesGit/SVN commitsRelated reports
 [2015-08-12 17:02 UTC] bugs dot php dot net at ss dot st dot tc
-Summary: extract() turns array array elements to references +Summary: extract() turns array elements to references
 [2015-08-12 17:02 UTC] bugs dot php dot net at ss dot st dot tc
(fixed typo in bug "Summary" field)
 [2015-08-13 05:38 UTC] laruence@php.net
Automatic comment on behalf of laruence
Revision: http://git.php.net/?p=php-src.git;a=commit;h=dc5c6ab774ff4f52675a663cb241896ca5d804cf
Log: Fixed bug #70250 (extract() turns array elements to references)
 [2015-08-13 05:38 UTC] laruence@php.net
-Status: Open +Status: Closed
 [2015-08-18 16:24 UTC] ab@php.net
Automatic comment on behalf of laruence
Revision: http://git.php.net/?p=php-src.git;a=commit;h=dc5c6ab774ff4f52675a663cb241896ca5d804cf
Log: Fixed bug #70250 (extract() turns array elements to references)
 [2016-07-20 11:37 UTC] davey@php.net
Automatic comment on behalf of laruence
Revision: http://git.php.net/?p=php-src.git;a=commit;h=dc5c6ab774ff4f52675a663cb241896ca5d804cf
Log: Fixed bug #70250 (extract() turns array elements to references)
 
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