Bug #52521 [NEW]: serialize() loses reference to root

From: Date: Tue, 03 Aug 2010 07:14:33 +0000
Subject: Bug #52521 [NEW]: serialize() loses reference to root
Groups: php.bugs 
Request: Send a blank email to php-bugs+get-153043@lists.php.net to get a copy of this message 
From:             
Operating system: WIN32
PHP version:      5.3.3
Package:          *Programming Data Structures
Bug Type:         Bug
Bug description:serialize() loses reference to root

Description:
------------
When trying to serialize -> unserialize a structure (i.e. array) containing
a child (or a subordinate child) referencing the root element (meaning the
structure to serialize) itself, it will be lost afterwards.
This leads to annoying misbehaviour and memory abuse.

If I unserialize the "correct" serialized string, it works correctly. May
be its a bug in reference creation?!

Test script:
---------------
$Array = array(
	'a' => 1
);
$Array['b'] = &$Array;

echo "print_r():\n";
echo "----------\n";
print_r($Array);
echo "\n";

echo "serialize():\n";
echo "------------\n";
echo serialize($Array);
echo "\n\n";

echo "print_r(unserialize(serialize())):\n";
echo "----------------------------------\n";
print_r(unserialize(serialize($Array)));
echo "\n";

echo "*** modify referenced value ***\n\n";

$Array['a'] = 2;

echo "print_r():\n";
echo "----------\n";
print_r($Array);
echo "\n";

echo "*** modify re-serialized refererenced value ***\n\n";

$Array['a'] = 1;
$Array = unserialize(serialize($Array));

$Array['a'] = 2;

echo "print_r():\n";
echo "----------\n";
print_r($Array);
echo "\n";

echo "*** using correct value ***\n\n";

$Array = unserialize('a:2:{s:1:"a";i:1;s:1:"b";R:1;}');
echo "print_r():\n";
echo "----------\n";
print_r($Array);
echo "\n";

Expected result:
----------------
print_r():
----------
Array
(
    [a] => 1
    [b] => Array
 *RECURSION*

)

serialize():
------------
a:2:{s:1:"a";i:1;s:1:"b";R:1;}

print_r(unserialize(serialize())):
----------------------------------
Array
(
    [a] => 1
    [b] => Array
 *RECURSION*

)

*** modify referenced value ***

print_r():
----------
Array
(
    [a] => 2
    [b] => Array
 *RECURSION*

)

*** modify re-serialized refererenced value ***

print_r():
----------
Array
(
    [a] => 2
    [b] => Array
 *RECURSION*

)

*** using correct value ***

print_r():
----------
Array
(
    [a] => 1
    [b] => Array
 *RECURSION*
)



Actual result:
--------------
print_r():
----------
Array
(
    [a] => 1
    [b] => Array
        (
            [a] => 1
            [b] => Array
 *RECURSION*
        )

)

serialize():
------------
a:2:{s:1:"a";i:1;s:1:"b";a:2:{s:1:"a";i:1;s:1:"b";R:3;}}

print_r(unserialize(serialize())):
----------------------------------
Array
(
    [a] => 1
    [b] => Array
        (
            [a] => 1
            [b] => Array
 *RECURSION*
        )

)

*** modify referenced value ***

print_r():
----------
Array
(
    [a] => 2
    [b] => Array
        (
            [a] => 2
            [b] => Array
 *RECURSION*
        )

)

*** modify re-serialized refererenced value ***

print_r():
----------
Array
(
    [a] => 2
    [b] => Array
        (
            [a] => 1
            [b] => Array
 *RECURSION*
        )

)

*** using correct value ***

print_r():
----------
Array
(
    [a] => 1
    [b] => Array
 *RECURSION*
)



-- 
Edit bug report at http://bugs.php.net/bug.php?id=52521&edit=1
-- 
Try a snapshot (PHP 5.2):            http://bugs.php.net/fix.php?id=52521&r=trysnapshot52
Try a snapshot (PHP 5.3):            http://bugs.php.net/fix.php?id=52521&r=trysnapshot53
Try a snapshot (trunk):              http://bugs.php.net/fix.php?id=52521&r=trysnapshottrunk
Fixed in SVN:                        http://bugs.php.net/fix.php?id=52521&r=fixed
Fixed in SVN and need be documented: http://bugs.php.net/fix.php?id=52521&r=needdocs
Fixed in release:                    http://bugs.php.net/fix.php?id=52521&r=alreadyfixed
Need backtrace:                      http://bugs.php.net/fix.php?id=52521&r=needtrace
Need Reproduce Script:               http://bugs.php.net/fix.php?id=52521&r=needscript
Try newer version:                   http://bugs.php.net/fix.php?id=52521&r=oldversion
Not developer issue:                 http://bugs.php.net/fix.php?id=52521&r=support
Expected behavior:                   http://bugs.php.net/fix.php?id=52521&r=notwrong
Not enough info:                     http://bugs.php.net/fix.php?id=52521&r=notenoughinfo
Submitted twice:                     http://bugs.php.net/fix.php?id=52521&r=submittedtwice
register_globals:                    http://bugs.php.net/fix.php?id=52521&r=globals
PHP 4 support discontinued:          http://bugs.php.net/fix.php?id=52521&r=php4
Daylight Savings:                    http://bugs.php.net/fix.php?id=52521&r=dst
IIS Stability:                       http://bugs.php.net/fix.php?id=52521&r=isapi
Install GNU Sed:                     http://bugs.php.net/fix.php?id=52521&r=gnused
Floating point limitations:          http://bugs.php.net/fix.php?id=52521&r=float
No Zend Extensions:                  http://bugs.php.net/fix.php?id=52521&r=nozend
MySQL Configuration Error:           http://bugs.php.net/fix.php?id=52521&r=mysqlcfg

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