Description:
------------
When creating a new DateTime object, if given a parseable string with a timezone 
descriptor such as "Monday, 15-Aug-05 15:52:01 PDT" AND a DateTimeZone argument, 
the DateTimeZone argument will be completely ignored.

Please either reopen #40743 or fix this bug if it is a regression for a different 
reason.

This is broken on 5.3.3 and trunk.

Test script:
---------------
$a = new DateTime('Monday, 15-Aug-05 15:52:01 PDT', new DateTimeZone('America/New_York'));
print_r($a);


Expected result:
----------------
An exception.

If you absolutely must, which you shouldn't, a warning and an automatic conversion 
of the date string to the proper time in America/New_York.

Actual result:
--------------
DateTime Object
(
    [date] => 2005-08-15 15:52:01
    [timezone_type] => 2
    [timezone] => PDT
)