Description:
------------
When you assign a value to a class member that was not declared the system defines a new class member.
I'm not sure this is a feature or a bug.
I would expect an error or at least a notice or a warning.

Reproduce code:
---------------
<?php
class foo {
 function __construct() {
  $this->foo = "test";
 }
}

$bar = new foo();

print $bar->foo;

?>


Expected result:
----------------
Notice/Warning/Error

Actual result:
--------------
test