A small php file that reproduces bug

<?php

class Base
{
private $a;
private $b;
private $c;
private $d;
private $e;
private $f;
private $g;
private $h;
private $i;
private $j;
private $k;
private $l;
private $m;
private $n;
private $o;
private $p;
private $q;
private $r;
private $s;
private $t;
private $u;
private $v;
private $w;
private $x;
private $y;
private $z;
private $z1; // comment these last few variable out and $z then disappears from member list!
private $z2;
private $z3;
private $z4;

public function __construct()
{
    $this->i = 99;
    $this->j = 88;
}

}

class Extension extends Base
{
private $k;
private $m;
private $j;

public function __construct()
{
    $this->k = 77;
    $this->m = 66;
    $this->j = 55;
}

}

$b = new Base();
$e = new Extension();

echo "Hello World\n";

?>

You can use this php file to replicate. Debug and list the variables $b
and $e. On my more complex code, some members are missing. In fact, in the base
when I don't declare $z1, $z2, $z3 and $z4 then $z is hidden.

$ php -v
PHP 5.3.2-1ubuntu4.2 with Suhosin-Patch (cli) (built: May 13 2010 20:03:45)
Copyright (c) 1997-2009 The PHP Group
Zend Engine v2.3.0, Copyright (c) 1998-2010 Zend Technologies
with Xdebug v2.1.0, Copyright (c) 2002-2010, by Derick Rethans