PHP function to return an array representation of calender month

If you need an array representation of a calender month this function will come in handy. This function will return an array of a given month with days properly distributed in to weeks, as in real calendar.

public function buildMonthCalendar($year, $month) {

        $calendar = array(
            'week-1' => array('Mon' => null, 'Tue' => null, 'Wed' => null, 'Thu' => null, 'Fri' => null, 'Sat' => null, 'Sun' => null),
            'week-2' => array('Mon' => null, 'Tue' => null, 'Wed' => null, 'Thu' => null, 'Fri' => null, 'Sat' => null, 'Sun' => null),
            'week-3' => array('Mon' => null, 'Tue' => null, 'Wed' => null, 'Thu' => null, 'Fri' => null, 'Sat' => null, 'Sun' => null),
            'week-4' => array('Mon' => null, 'Tue' => null, 'Wed' => null, 'Thu' => null, 'Fri' => null, 'Sat' => null, 'Sun' => null),
            'week-5' => array('Mon' => null, 'Tue' => null, 'Wed' => null, 'Thu' => null, 'Fri' => null, 'Sat' => null, 'Sun' => null),
            'week-6' => array('Mon' => null, 'Tue' => null, 'Wed' => null, 'Thu' => null, 'Fri' => null, 'Sat' => null, 'Sun' => null),
        );

        $startOfMonth = "{$year}-{$month}-01";
        $result = strtotime("{$year}-{$month}-01");
        $endOfMonth =  date('Y-m-d', strtotime( date('Y-m-d', strtotime( $result . '+1 month')).' -1 second'));

        $j = 1;
        for ($i = $startOfMonth; $i != $endOfMonth;) {

            $weekDay = date('D', strtotime($i));
            $calendar["week-{$j}"][$weekDay] = date('d', strtotime($i));
            if ($weekDay == 'Sun') {
                $j++; //jump to next week
            }
            $i = date('Y-m-d', strtotime($i . ' +1 day'));
        }

        $weekDay = date('D', strtotime($endOfMonth)); //last day of the month
        $calendar["week-{$j}"][$weekDay] = date('d', strtotime($endOfMonth));

        return $calendar;
    }