Description:
------------
When i create a new class, derived from XMLReader and I add new (private) properties it works perfectly for simple values (int, string), but when I use arrays, it simply forgets the value.

Reproduce code:
---------------
<?php

     class MyReader extends XMLReader {

         private $test;
         private $arr = array();

         public function test() {
             // Adding a normal variable works just fine:
             $this->test = 'test';
             echo($this->test);

             // But an array.. is a different story
             $this->arr[0] = '1';
             print_r($this->arr);
             die();
         }

     }

     $v = new MyReader();
     $v->test();
 ?>

Expected result:
----------------
testArray(0=>'1')

or something along those lines

Actual result:
--------------
testArray()