Description:
------------
Then saving an object with a static variable in a session, when the session is reloaded, the variable is not set anymore.

Reproduce code:
---------------
<?php
session_start();

class c1 {
	public static $ids = 1;
	private $id;
	
	public function __construct() {
		$this->id = c1::$ids++;
	}
	public function getId() {
		return $this->id;
	}
} 
$_SESSION['test'][] = new c1();
$_SESSION['test'][] = new c1();
echo '<pre>Output:';

foreach ($_SESSION['test'] as $class) {
	echo $class->getId()."\n";
}
echo '</pre>'

?>

Expected result:
----------------
Output:
1
2
3
4
5
6
7
8
9

Actual result:
--------------
Output:
1
2
1
2
1
2
1
2