/**
 * Function returns a date in the future by increasing the days
 *
 * @param int $month
 * @param int $year
 * @param int $day
 * @param int $numDays
 * @return array
 */
function futureDate($month,$year,$day,$numDays) {
        return explode('-',date('Y-m-d',mktime(0,0,0,$month,$day+$numDays,$year)));
}


// Example Use - Find a date 45 days in the future Starting with 2-15-2009
list($year,$month,$day) = futureDate(2,2009,15,45);

// Outputs 04-01-2009
echo $month . "-" . $day . "-" . $year;