Description:
------------
Using PHP from the standard Windows installer and running under Apache, the following code both produces unexpected output and crashes PHP.  The code is a simple OOP variable test.

A similar bug was posted (http://bugs.php.net/bug.php?id=26930) but did not crash PHP.

To reproduce the crash, uncomment the test method in class B or C and seg fault away.

The bug is reproducible on every OS I've tested, including Linux and Mac with standard PHP installs running under Apache.



Reproduce code:
---------------
class A {
	protected static $instance;
	public $test = "A";
	
	public function getInstance()
	{
		if (! self::$instance) self::$instance = new A;
		return self::$instance;
	}
	
	public function test()
	{
		echo $this->test;
	}
	
}


class B extends A
{
	protected static $instance;
	//protected $test = "B";
	
	public function getInstance()
	{
		if (! self::$instance) self::$instance = new B;
		self::$instance->test = "B";
		return self::$instance;
	}

	/*
	public function test()
	{
		echo $this->test();
	}
	*/

}


class C extends A
{
	protected static $instance;
	//protected $test = "C";

	public function getInstance()
	{
		if (! self::$instance) self::$instance = new C;
		self::$instance->test = "C";
		return self::$instance;
	}

	/*
	public function test()
	{
		echo $this->test();
	}
	*/

}


$a = new A;
$a->test();
echo "\n----------<br>\n";
$b = new B;
$a->test();
$b->test();
echo "\n----------<br>\n";
$c = new C;
$a->test();
$b->test();
$c->test();
echo "\n----------<br>\n";


Expected result:
----------------
A
----------
AB
----------
ABC
----------

Actual result:
--------------
A
----------
AA
----------
AAA
----------