Description:
------------
When writing class method and function declarations, php allows multiple 
parameters with the same name. This seems like something that should produce a 
warning or notice.

Test script:
---------------
class Foo
{
    public function bar($param, $param) {
       echo $param;
    }
}


$foo = new Foo();
$foo->bar('param1', 'param2');

Expected result:
----------------
I feel as though this should produce a warning or notice.

Actual result:
--------------
Runs without any issues and echos 'param2'