Description:
------------
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:

Sleep
Wakeup



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);
unserialize($b);

Expected result:
----------------
Serialize
Unserialize

Actual result:
--------------
Serialize