From:
Operating system: CentOS 5.5
PHP version: 5.3.5
Package: Variables related
Bug Type: Bug
Bug description:scalar reference of array element has unintended side effects
Description:
------------
Adding a scalar reference to an array element changes array assignment
behavior.
In a regular array assignment, elements are all copied by value. But if a
scalar
reference has been made to an array element, that element is copied by
reference
in a subsequent array assignment. The code looks exactly the same, so the
behavior shouldn't change just because there's a reference floating out
there
somewhere.
Test script:
---------------
<?php
$arr1 = array(1);
echo "\nbefore:\n";
echo "\$arr1[0] == {$arr1[0]}\n";
$arr2 = $arr1;
$arr2[0]++;
echo "\nafter:\n";
echo "\$arr1[0] == {$arr1[0]}\n";
echo "\$arr2[0] == {$arr2[0]}\n";
$arr3 = array(1);
$a =& $arr3[0];
echo "\nbefore:\n";
echo "\$a == $a\n";
echo "\$arr3[0] == {$arr3[0]}\n";
$arr4 = $arr3;
$arr4[0]++;
echo "\nafter:\n";
echo "\$a == $a\n";
echo "\$arr3[0] == {$arr3[0]}\n";
echo "\$arr4[0] == {$arr4[0]}\n";
Expected result:
----------------
before:
$arr1[0] == 1
after:
$arr1[0] == 1
$arr2[0] == 2
before:
$a == 1
$arr3[0] == 1
after:
$a == 1
$arr3[0] == 1
$arr4[0] == 2
Actual result:
--------------
before:
$arr1[0] == 1
after:
$arr1[0] == 1
$arr2[0] == 2
before:
$a == 1
$arr3[0] == 1
after:
$a == 2
$arr3[0] == 2
$arr4[0] == 2
--
Edit bug report at http://bugs.php.net/bug.php?id=53863&edit=1
--
Try a snapshot (PHP 5.2):
http://bugs.php.net/fix.php?id=53863&r=trysnapshot52
Try a snapshot (PHP 5.3):
http://bugs.php.net/fix.php?id=53863&r=trysnapshot53
Try a snapshot (trunk):
http://bugs.php.net/fix.php?id=53863&r=trysnapshottrunk
Fixed in SVN:
http://bugs.php.net/fix.php?id=53863&r=fixed
Fixed in SVN and need be documented:
http://bugs.php.net/fix.php?id=53863&r=needdocs
Fixed in release:
http://bugs.php.net/fix.php?id=53863&r=alreadyfixed
Need backtrace:
http://bugs.php.net/fix.php?id=53863&r=needtrace
Need Reproduce Script:
http://bugs.php.net/fix.php?id=53863&r=needscript
Try newer version:
http://bugs.php.net/fix.php?id=53863&r=oldversion
Not developer issue:
http://bugs.php.net/fix.php?id=53863&r=support
Expected behavior:
http://bugs.php.net/fix.php?id=53863&r=notwrong
Not enough info:
http://bugs.php.net/fix.php?id=53863&r=notenoughinfo
Submitted twice:
http://bugs.php.net/fix.php?id=53863&r=submittedtwice
register_globals:
http://bugs.php.net/fix.php?id=53863&r=globals
PHP 4 support discontinued: http://bugs.php.net/fix.php?id=53863&r=php4
Daylight Savings: http://bugs.php.net/fix.php?id=53863&r=dst
IIS Stability:
http://bugs.php.net/fix.php?id=53863&r=isapi
Install GNU Sed:
http://bugs.php.net/fix.php?id=53863&r=gnused
Floating point limitations:
http://bugs.php.net/fix.php?id=53863&r=float
No Zend Extensions:
http://bugs.php.net/fix.php?id=53863&r=nozend
MySQL Configuration Error:
http://bugs.php.net/fix.php?id=53863&r=mysqlcfg
