Description:
------------
get_class_vars() sometimes returns protected and private variables, depending on the calling scope. However, the behaviour is inconsistent with the visibility of the variables. Private variables are found when calling from child scope (they aren't visible), and protected variables are _not_ found from parent scope (they are visible).

It feels as though get_class_vars() should respect visibility entirely or not at all

The expected output below is what would be produced if get_class_vars respected visibility consistently. I've put a patch (built against snap php5.3-200808180830) that produces this behaviour on pastebin:
http://pastebin.com/m10403f42

I used the old logic from property_exists() for the patch (although that has now been changed so that property_exists no longer respects visibility)

Reproduce code:
---------------
<?php
class Ancestor {
  function test() {
    var_dump(get_class_vars("Tester"));
    var_dump(Tester::$prot);
  }
}

class Tester extends Ancestor {
  static protected $prot = "protected var";
  static private $priv = "private var";
}

class Child extends Tester {
  function test() { var_dump(get_class_vars("Tester")); }
}

echo "\n From parent scope\n";
$parent = new Ancestor();
$parent->test();
echo "\n From child scope\n";
$child = new Child();
$child->test();
?>


Expected result:
----------------
 From parent scope
array(1) {
  ["prot"]=>
  string(13) "protected var"
}
string(13) "protected var"

 From child scope
array(1) {
  ["prot"]=>
  string(13) "protected var"
}


Actual result:
--------------
 From parent scope
array(0) {
}
string(13) "protected var"

 From child scope
array(2) {
  ["prot"]=>
  string(13) "protected var"
  ["priv"]=>
  string(11) "private var"
}