What is the php syntax for adding or subtracting dates?

For example, I'd like to do something like this:

2002-04-03 - 2002-04-02 = 1

or 

2002-04-03 - 2002-04-02 = 0000-00-01

or 

2002-04-03 + 0000-00-01 = 2002-04-03

etc.

Can anybody help this newbie?

Thanks!



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