Description:
------------
When calling ReflectionClass::getStaticProperties() with a '&' operator, we can easily modify the private static fields outside the class, but only for fields declared in the parent class, not the class itself.
But I don't know if PHP should make it possible to modify the inaccessible class static fields or not, since the PHP manual just contains a prototype in Reflection.

Reproduce code:
---------------
class Test {
	private static $data = 1;
	private static $data4 = 4;

	public static function test1() {
		echo self::$data;
	}
}

class Test2 extends Test {
	private static $data2 = 2;
	public static $data3 = 3;
}

$r = new ReflectionClass('Test2');
$m = & $r->getStaticProperties(); //here, with the '&'

$m['data'] = 100; //$data is in the parent class.
$m['data4'] = 400; //$data4 is in the parent class.
$m['data2'] = 200; //no effect.
$m['data3'] = 300; //no effect.
Test::test1();
echo "\n";
$m = $r->getStaticProperties();
foreach ($m as $key => $val) {
	echo $key . '==>' . $val . "\n";
}

Expected result:
----------------
1
data2==>2
data3==>3
data==>1
data4==>4

/**OR**/

100
data2==>200
data3==>300
data==>100
data4==>400

Actual result:
--------------
100
data2==>2
data3==>3
data==>100
data4==>400