Description:
------------
I found this problem while i was going through the Iterators concept.

The problem:

class NewClass is inheriting MyClass , so the protected variable $protected should  be accessible in the NewClass. But while printing out the results , the $protected variable is not shown in the key-value combinations except for the public variables.

Test script:
---------------
<?php
class MyClass
{
    public $var1 = 'value 1';
    public $var2 = 'value 2';
    public $var3 = 'value 3';

    protected $protected = 'protected var';
    private   $private   = 'private var';

    function iterateVisible() {
        echo "MyClass::iterateVisible:\n";
        foreach($this as $key => $value) {
            print "$key => $value\n";
        }
    }
}

class NewClass extends MyClass
{

}


$class = new NewClass();

foreach($class as $key => $value) {
    print "$key => $value\n";
}
echo "\n"

Expected result:
----------------
var1 => value 1
var2 => value 2
var3 => value 3
protected => protected var

Actual result:
--------------
var1 => value 1
var2 => value 2
var3 => value 3