Bug #52521 [Com]: serialize() loses reference to root
Edit report at http://bugs.php.net/bug.php?id=52521&edit=1
ID: 52521
Comment by: martin dot leucht at gmail dot com
Reported by: martin dot leucht at gmail dot com
Summary: serialize() loses reference to root
Status: Open
Type: Bug
Package: *Programming Data Structures
Operating System: WIN32
PHP Version: 5.3.3
Block user comment: N
New Comment:
I have to correct myself:
> If I unserialize the "correct" serialized string, it works correctly.
It just works for print_r() afterwards, but if I do some stuff on the
referenced value it creates even more confusing structures.
Test script:
------------
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";
$Array['b']['a'] = 2;
echo "print_r():\n";
echo "----------\n";
print_r($Array);
echo "\n";
Actual result
-------------
*** using correct value ***
print_r():
----------
Array
(
[a] => 1
[b] => Array
*RECURSION*
)
print_r():
----------
Array
(
[a] => 1
[b] => Array
(
[a] => 2
[b] => Array
(
[a] => 1
[b] => Array
*RECURSION*
)
)
)
Expected result
---------------
*** using correct value ***
print_r():
----------
Array
(
[a] => 1
[b] => Array
*RECURSION*
)
print_r():
----------
Array
(
[a] => 2
[b] => Array
*RECURSION*
)
Previous Comments:
------------------------------------------------------------------------
[2010-08-03 09:14:31] martin dot leucht at gmail dot com
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*
)
------------------------------------------------------------------------
--
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