note 55798 added to language.oop.serialization
| From: | fluw at gmx dot net | Date: | Sat, 13 Aug 2005 16:06:15 +0000 |
| Subject: | note 55798 added to language.oop.serialization | ||
| Groups: | php.notes | ||
| Request: | Send a blank email to php-notes+get-93557@lists.php.net to get a copy of this message | ||
never serialize an object, if it contains references to itself. Just create the object in an array,
or make a reference of this object in an array before calling serialize() and serialize the array
instead of the object.
print_r is fine to validate a reference: The reference will be serialized in a right way, if print_r
returns a *recursive* on right place (look carefully).
Just have a look on this small example:
<?
class foo {
var $bar;
function addBar() {
$this->bar = new bar(&$this);
}
}
class bar {
var $parentFoo;
function bar(&$partentBean) {
$this->parentFoo =& $partentBean;
}
}
$foo = new foo();
$foo->addBar();
$fooArray = array(&$foo);
echo "<pre>";
print_r($foo);
echo serialize($foo);
echo "</pre>";
echo "<pre>";
print_r($fooArray);
echo serialize($fooArray);
echo "</pre>";
?>
OutPut:
foo Object
(
[bar] => bar Object
(
[parentFoo] => foo Object
(
[bar] => *RECURSION*
)
)
)
O:3:"foo":1:{s:3:"bar";O:3:"bar":1:{s:9:"parentFoo";O:3:"foo":1:
{s:3:"bar";O:3:"bar":1:{s:9:"parentFoo";R:3;}}}} //sorry for linebreak
Array
(
[0] => foo Object
(
[bar] => bar Object
(
[parentFoo] => *RECURSION*
)
)
)
a:1:{i:0;O:3:"foo":1:{s:3:"bar";O:3:"bar":1:{s:9:"parentFoo";R:2;}}}
if you serialize the object, the the refernce becomes a copy an first the reference inside the copy
is a real reference, (but just only to the copy, for sure :).
----
Manual Page -- http://www.php.net/manual/en/language.oop.serialization.php
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