When doing print_r on an object the array keys for the private and protected variables do not show, but their values do.

-----[ class.php ]-----
<?php
class foo
{ 
  private $bar;
  public  $bar2;
  protected $bar3;
  function __construct()
  {
     $this->bar  = 1;
     $this->bar2 = 2;
     $this->bar3 = 3; 
  }
} 
?>
-----[ run.php ]-----
#!/php5/bin/php -q
<?php
 require_once "class.php";
 $a = New foo;
 print_r($a);
?>
-----[ output ]-----
foo Object
(
    [] => 1
    [b] => 2
    [] => 3
)
-----[ config ]-----
./configure --prefix=/php5 \
--with-gettext \
--with-gd=/usr \
--with-jpeg-dir=/usr/local \
--with-mcrypt=/usr/local \
--with-mcal=/usr/local \
--with-ming=/usr/local \
--with-mhash=/usr/local \
--with-mysql=/usr/local/mysql \
--with-zlib=/usr/local \
--with-ncurses \
--with-tiff-dir="/usr/local" \
--with-unixODBC=/usr/local/unixODBC \
--with-xml \
--with-calendar=shared \
--with-png-dir=/usr/local \
--with-freetype=/usr/local \
--with-freetype-dir=/usr/local \
--with-ttf=/usr/local \
--with-openssl=/usr/local \
--with-bz2 \
--with-dom \
--enable-bcmath \
--enable-calendar \
--enable-dio \
--enable-exif \
--enable-ftp \
--enable-gd-native-ttf \
--enable-pcntl \
--enable-shmop \
--enable-sigchild \
--enable-sockets \
--enable-track-vars \
--enable-magic-quotes \
--enable-trans-sid \
--enable-libgcc \
--enable-wddx \
--enable-sysvshm \
--enable-sysvsem \
--enable-sysvmsg