Description:
------------
if a protected data member is re-declared as public in a child class, it is redefined as public.  Shouldn't the parent class protected declaration override the child class as it does for private?

Reproduce code:
---------------
<?php
class test
{
	protected $a = 6;
	function __construct()
	{
		print $this->a;
	}
}

class my extends test
{
	var $a = 7;
	function __construct()
	{
		print $this->a;
		parent::__construct();
	}
}
$a = new test; // 6
$a = new my; // 77
print $a->a; // should give error, is 7
$a->a = 4;
print $a->a; // 4
?>

Expected result:
----------------
Fatal Error, cannot redeclare a protected data member as public

Actual result:
--------------
67774