Description:
------------
When you store a closure as a class property, while having a method with the same name, it's unclear (I don't think this is documented anywhere) what $obj->name($arg) will do.  If this is the case, a warning about code ambiguity ought to be raised.  

This is a potentially very confusing scenario, perhaps an E_STRICT error ought to be raised whenever two class members share the same name, regardless of whether a property contains a closure or not.

Reproduce code:
---------------
class foo {
  public $bar;
  public function bar() {
    echo "Inside a method!";
  }
}

$obj = new foo();
$obj->bar = function() { echo "Inside a closure!"; };

$obj->bar();



Expected result:
----------------
Notice: ....

Inside a method!

Actual result:
--------------
Inside a method!