Description:
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From manual page: http://www.php.net/class.dateperiod
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The DatePeriod page doesn't give any information that I can find about the class 
of the objects that result from iterating over it.

In particular, as far as I can tell, if you do a foreach on a DatePeriod, the 
instances of the iterator are DateTime objects. Which is great--it's exactly what 
I wanted--but it doesn't appear to be documented.

Perhaps it's obvious to people who know more about iterators. But for me, I had 
to figure it out by reading people's posts, and confirm it by reading this Stack 
Overflow answer: (http://stackoverflow.com/questions/3416288/parameterizing-php-
code-with-dateperiod-dateinterval-classes)

More generally, the DatePeriod page doesn't really explain at all what a 
DatePeriod is or how to use it. Fortunately, the user-supplied examples help a 
lot with that.