Description:
------------
The documentation of the DateTime::createDateFromFormat is missing a hint on how 
to escape unwanted characters from a sequence.

e.g. if I'd want to parse this string: '23h 15m 03s' i'd had to escape 'h', 'm' 
and 's'.

So I think it should be documented how to accomplish that.

---
From manual page: http://www.php.net/datetime.createfromformat
---


Expected result:
----------------
Information on how to correctly escape unwanted characters from the string to 
parse.

Actual result:
--------------
no documentation at all