Description:
------------
I got another strange behaviour with classes functions.

get_class_methods(Object $obj) returns private and protected methods. get_class_vars(string $class) returns private and protected properties.
However, get_object_vars() doesn't.

This method takes an Object parameter and I think that its behaviour should be the same as get_class_methods(Object $obj).

This bug is "related" to bug #30381.

Reproduce code:
---------------
<?php
class A {
	
	protected $plip;
	
	private function run() {
		
	}

}

class B extends A {
}

class hariCow extends B {

	private $plop = 'beta';

}

$db = new hariCow;

var_dump(get_class_vars('hariCow'));
var_dump(get_object_vars($db));

var_dump(get_class_methods($db));

echo $db->run();
?>

Expected result:
----------------
array(2) { ["plop"]=>  string(4) "beta" ["plip"]=>  NULL } array(2) { ["plop"] => ... ["plip"] => ... }
array(1) { [0]=>  string(3) "run" } 

Actual result:
--------------
array(2) { ["plop"]=>  string(4) "beta" ["plip"]=>  NULL } array(0) { }
array(1) { [0]=>  string(3) "run" }