Description:
------------
If I create a class with private or protected properties in it the contents of those can be seen from the outside via the functions var_dump and print_r. This may lead to some security vulnerabilities with future applications.

This may not be actually a bug, but it seems rather illogical to be able to access the values with this method while others fail.

Reproduce code:
---------------
class Test
{
   private $foo;

   function __construct ()
   {
      $this->foo = 'xy';
   }
}

$test = new Test;

print_r($test);

Expected result:
----------------
test Object
(
)

Actual result:
--------------
test Object
(
   [foo:private] => xy
)