Description:
------------
 If you declare a static data member (eg x),
$this->x refers to a different variable
without generating any warnings.

 Arguably, the proper behavior when setting
a class variable through $this should first
be to check if there are any static member
variables of the same name and *then* check
for instantiated member variables.

Reproduce code:
---------------
#!/usr/local/bin/php5 -q
<?
// error reporting is set to E_ALL in php.ini
class Blah {
    public static $x;
    public function show() {
        Blah::$x = 1;
        $this->x = 5; // no warning, but refers to different variable

        echo '   Blah::$x = '. Blah::$x ."\n";
        echo '$   this->x = '. $this->x ."\n";
    }
}

$b = new Blah();
$b->show();
?>

Expected result:
----------------
either: (preferable)

   Blah::$x = 5
   $this->x = 5



-or-

 at the minimum, display a warning

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

   Blah::$x = 1
   $this->x = 5