[PHP-DEV] Adding a time interval to an interval

[Simon Schick]

Hi, all

I'd like to extend the API of php by a method.

Currently it is possible to create a DateInterval ... but if you have two
DateIntervals and want to "combine" them, you need to do it by your own.

I think it'd be a good idea to add a method for that to the DateInterval
class.

http://stackoverflow.com/questions/11556731/how-we-can-add-two-date-intervals-in-php

Bye,
Simon