[PHP][好文] Calculate business days (計算兩個日期之間的工作天數)

原文

function getWorkingDays($startDate, $endDate, $holidays) {

        $endDate = strtotime($endDate);

        $startDate = strtotime($startDate);

        $days = ($endDate - $startDate) / 86400 + 1;

        $no_full_weeks = floor($days / 7);

        $no_remaining_days = fmod($days, 7);

        $the_first_day_of_week = date("N", $startDate);

        $the_last_day_of_week = date("N", $endDate);

        if ($the_first_day_of_week <= $the_last_day_of_week) {

                if ($the_first_day_of_week <= 6 && 6 <= $the_last_day_of_week) $no_remaining_days--;

                if ($the_first_day_of_week <= 7 && 7 <= $the_last_day_of_week) $no_remaining_days--;

        }

        else {

                if ($the_first_day_of_week == 7) {

                        $no_remaining_days--;

                        if ($the_last_day_of_week == 6) {

                                $no_remaining_days--;

                        }

                }

                else {

                        $no_remaining_days -= 2;

                }

        }

        $workingDays = $no_full_weeks * 5;

        if ($no_remaining_days > 0 ) {

                $workingDays += $no_remaining_days;

        }

        foreach($holidays as $holiday) {

                $time_stamp = strtotime($holiday);

                if ($startDate <= $time_stamp && $time_stamp <= $endDate && date("N",$time_stamp) != 6 && date("N",$time_stamp) != 7)

                $workingDays--;

        }

        return $workingDays; 

}

//Example:

$holidays = array("2008-12-25","2008-12-26","2009-01-01");

echo getWorkingDays("2008-12-22","2009-01-02",$holidays)

// => will return 7