Description:
------------
When a class instance is get from memcache, it is unserialized before returned. That does not work, when the __wakeup()-function of the class itself asks for another value.

php is from ubuntu feisty (5.2.1-0ubuntu1.2) and php-memcache is compiled with a small patch to fix the different php include paths on ubuntu.

Reproduce code:
---------------
function errorCallback($host, $port)
{
        echo "ERROR: $host:$port\n";
}

$mmc = new Memcache;
$mmc->addServer(/* host */ 'localhost', /* port */ 11211, /* persistent */ true, /* weight */ 10, /* timeout */ 10, /* retry time */ 1, /* status */ true, /* error callback */ 'errorCallback');

class A
{
}

class B
{
        protected $a;

        public function __construct()
        {
                $this->c = new A;
        }

        public function __sleep()
        {
                $this->c = 'a';
                return array_keys(get_object_vars($this));
        }

        public function __wakeup()
        {
                global $mmc;
                $this->c = $mmc->get('a');
        }
}

$a = new A;
$mmc->set('a', clone $a, 0, 0);

$b = new B;
$mmc->set('b', clone $b, 0, 0);

$c = $mmc->get('b');

var_dump($c);

Expected result:
----------------
The var_dump($c) should print a string representation of an instance of class B...

Actual result:
--------------
the line "$c = $mmc-get('b')" seems to call the error callback function and returns "false" (object not found)

uwe@harry:~$ php mmctest.php
ERROR: localhost:11211
bool(false)

the following is the memcached output with commandline argument -vv:

<32 new client connection
<32 set a 1 0 12
>32 STORED
<32 set b 1 0 41
>32 STORED
<32 get b
>32 sending key b
>32 END
<32 get a
>32 sending key a
>32 END
<32 connection closed.

last thing is the trace log from xdebug:

TRACE START [2007-06-19 19:09:34]
    0.0012      64588   -> {main}() /home/uwe/mmctest.php:0
    0.0014      65072     -> Memcache->addserver(string(9), long, bool, long, long, long, bool, string(13)) /home/uwe/mmctest.php:9
                           >=> TRUE
    0.0017      65592     -> Memcache->set(string(1), class A, long, long) /home/uwe/mmctest.php:38
                           >=> TRUE
    0.0027      66304     -> B->__construct() /home/uwe/mmctest.php:40
                           >=> NULL
    0.0028      66692     -> Memcache->set(string(1), class B, long, long) /home/uwe/mmctest.php:41
    0.0029      66780       -> B->__sleep() /home/uwe/mmctest.php:0
    0.0029      66852         -> get_object_vars(class B) /home/uwe/mmctest.php:27
                               >=> array ('a' => NULL, 'c' => 'a')
    0.0031      67076         -> array_keys(array(2)) /home/uwe/mmctest.php:27
                               >=> array (0 => 'a', 1 => 'c')
                             >=> array (0 => 'a', 1 => 'c')
                           >=> TRUE
    0.0035      67420     -> Memcache->get(string(1)) /home/uwe/mmctest.php:43
    0.0037      75644       -> B->__wakeup() /home/uwe/mmctest.php:0
    0.0037      75644         -> Memcache->get(string(1)) /home/uwe/mmctest.php:33
                               >=> FALSE
                             >=> NULL
    0.0041      67436       -> errorCallback(string(9), long) /home/uwe/mmctest.php:0
                             >=> NULL
                           >=> FALSE
    0.0048      67684     -> var_dump(bool) /home/uwe/mmctest.php:45
                           >=> NULL
                         >=> 1
    0.0054      25208
TRACE END   [2007-06-19 19:09:34]