Description:
------------
Prior to v5.2.10 you could call userland functions in the magic method 
__sleep(). Now in 5.2.10, .11, .12 and .13 I just get a fatal error undefined 
function when I try to do so.

I've tested this in 5.3.2 and it works correctly as it does in 5.2.9 and before.

This is running on the standard 5.2.13 TS VS6 build and my session configuration 
is: 
[Session]
session.save_handler = files
session.save_path = "c:/php/tmp"
session.use_cookies = 1
session.use_only_cookies = 1
session.name = sID
session.auto_start = 0
session.cookie_lifetime = 0
session.cookie_path = /
session.cookie_domain =
session.cookie_httponly = 
session.serialize_handler = php
session.gc_probability = 1
session.gc_divisor     = 1000
session.gc_maxlifetime = 9000
session.bug_compat_42 = 0
session.bug_compat_warn = 1
session.referer_check =
session.entropy_length = 0
session.entropy_file =
session.cache_limiter = nocache
session.cache_expire = 180
session.use_trans_sid = 0
session.hash_function = 0
session.hash_bits_per_character = 5
url_rewriter.tags = 
"a=href,area=href,frame=src,input=src,form=,fieldset=,iframe=src"

Test script:
---------------
<?php
function inc ($foo) {
	return ($foo + 1);
}

class foo {
	function __construct() {
		$this->bar = 0;
	}
	function __sleep() {
		$this->bar = inc($this->bar);
		return array('bar');
	}	
	public $bar;
}

session_start();
if (!isset($_SESSION['foo'])) {
	$_SESSION['foo'] = new foo();
}
$foo = $_SESSION['foo'];

echo "foo->bar = ".$foo->bar."<br>";
?>

Expected result:
----------------
As you refresh the page given by the script, you should just see the number 
increment each time with no errors generated.

Actual result:
--------------
In 5.2.13, after refreshing the page you get:
Fatal error: Call to undefined function inc() in C:\test\sleeptest.php on line 12 

This worked correctly in 5.2.9 and before, and also works in 5.3.2