note 102316 added to function.strtotime

Do not use PHPDateTime below!!

It will make mistakes, especially with regards to leap years. $y%4 is NOT a reliable way to check for leap years. ($y%100 and $y%400 is involved aswell.)

I would replace the DateNextMonth function, if i needed it, with something like this:

function addMonth($orgdate)
{

        $next_month = strtotime($orgdate . ' +1 month');

        //If the month in orgdate has more days then the next month we want to use the last of the next month for all of them.
        $last_day_next_month = strtotime($orgdate . ' last day of next month');

        return date('Y-m-d', min($next_month, $last_day_next_month));
}

Trust strtotime to take care of the handling of leapyears and such instead of trying yourself. You will not make a better job. (I'm looking at you ash :) )

echo addMonth('2010-01-31');

Outputs:
2010-02-28.
----
Server IP: 69.147.83.197
Probable Submitter: 213.115.126.82
----
Manual Page -- http://www.php.net/manual/en/function.strtotime.php
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