Description:
------------
For classes with implemented __get and __isset, __get is automatically called when testing only if chained overloaded properties are set, despite the first property in chain doesn't exist. There is no reason to call __get anymore.

It's there from the beginning of __get/__isset, So maybe it's feature, but undocumented?

Test script:
---------------
class Xstd {}

class XOverloading
{
  function __isset($name) 
  {
    return FALSE;
  }

  function __get($name)
  {
    trigger_error('Error', E_USER_WARNING);
  }
}

$obj = new Xstd();
var_dump(isset($obj->prop1->prop2));

$obj = new XOverloading();
var_dump(isset($obj->prop1->prop2));

Expected result:
----------------
bool(false)

bool(false)

Actual result:
--------------
bool(false) 

Warning: Error in .... on line 13 
bool(false)