I use a function called count_days($date1,$date2)
that counts the number of days between two dates. But, my question is: the dates come from the DB, in an array like:
Array (
[imac] => Array (
[0] => 2002-10-10
[1] => 2003-11-22
[3] => 2004-11-10
)
[iphone] => Array (
[0] => 2007-09-11
[1] => 2008-05-12
[2] => 2009-06-14
[3] => 2010-06-05
)
)
As you can see the products may have a different number of subarrays.
I want to count the days between the first and the next date (and so on!) and then get the average of days.