Description:
------------
casting an object to array gives the possibility to get the values of protected/private member variables :

IMO, when casting to array with (array) only the public-ly visible members should returned.

Andrey 

Reproduce code:
---------------
<?php
class some {
        public $pub = 1;
        protected $prot = 2;
        private $priv = 3;

}
var_dump((array)new some());

?>

Expected result:
----------------
array(3) {
  ["pub"]=>
  int(1)
}

Actual result:
--------------
array(3) {
  ["pub"]=>
  int(1)
  ["*prot"]=>
  int(2)
  ["somepriv"]=>
  int(3)
}