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[2010-08-03 09:14 UTC] 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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Last updated: Sun Oct 26 07:00:01 2025 UTC |
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* )It seems it is array-related. The same thing using the stdclass works fine. Test script: ------------ <?php $Object = (object)array( 'a' => 1, 'b' => &$Object, ); print_r($Object); $Array = array( 'a' => 1, 'b' => &$Array, ); print_r($Array); $Array = unserialize(serialize($Array)); $Object = unserialize(serialize($Object)); $Object->b->a = 2; print_r($Object); $Array['b']['a'] = 2; print_r($Array); ?> Actual result: -------------- stdClass Object ( [a] => 1 [b] => stdClass Object *RECURSION* ) Array ( [a] => 1 [b] => Array ( [a] => 1 [b] => Array *RECURSION* ) ) stdClass Object ( [a] => 2 [b] => stdClass Object *RECURSION* ) Array ( [a] => 1 [b] => Array ( [a] => 2 [b] => Array *RECURSION* ) )