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Bug #61192 Serializable interface not calling unserialize()
Submitted: 2012-02-27 05:12 UTC Modified: 2012-02-27 09:59 UTC
From: slusarz at curecanti dot org Assigned:
Status: Not a bug Package: *Data Exchange functions
PHP Version: 5.3.10 OS: Linux
Private report: No CVE-ID: None
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From: slusarz at curecanti dot org
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 [2012-02-27 05:12 UTC] slusarz at curecanti dot org
unserialize() in a class implementing Serializable is not called when the serialized object is contained within a container element (e.g. array).

Compare with __wakeup() which IS called in the same environment.

In the test script below, if the class is modified to not extend Serializable, the output is:


Test script:
class Foo implements Serializable {

    public function __sleep() {
        print "Sleep\n";
        return array();

    public function __wakeup() {
        print "Wakeup\n";

    public function serialize() {
        print "Serialize\n";

    public function unserialize($data) {
        print "Unserialize\n";


$a = array(
    new Foo()

$b = serialize($a);

Expected result:

Actual result:


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 [2012-02-27 09:59 UTC]
-Status: Open +Status: Not a bug
 [2012-02-27 09:59 UTC]
Sorry, but your problem does not imply a bug in PHP itself.  For a
list of more appropriate places to ask for help using PHP, please
visit as this bug system is not the
appropriate forum for asking support questions.  Due to the volume
of reports we can not explain in detail here why your report is not
a bug.  The support channels will be able to provide an explanation
for you.

Thank you for your interest in PHP.

You have to return something from Foo::serialize().
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