PHP推算自然月、自然周、自然日代码示例

之前PHP项目中利用递归写的一个推算自然月、自然周、自然日的代码

例如（自然周）：

上周一00:00:00 到今天晚上周二23:59:59，计算后得到9天

    /**
     * 推算自然月
     * 自然月:假如今天1月8号,我要取前2个自然月,则为 12月1号00:00:00 到今天晚上(1月8号)23:59:59
     * @param int $naturalMonth  要推算的自然月数
     * @param null $time         从哪个时间开始推算  默认当前时间
     * @param bool $format       是否要格式化后的时间 默认时间戳
     * @return array
     */
    public static function getNaturalMonth($naturalMonth = 2, $time = null, $format = false)
    {
        if (empty($time)) {
            $time = time();
        }
        $naturalMonthArr = [];

        $currentTime = strtotime(date('Y-m-d 23:59:59', $time));
        $currentDay  = date("d", $currentTime); // 当前几号

        $endTime   = $currentTime;
        $startTime = $endTime - (3600 * 24 * $currentDay);

        $result = [];
        if ($naturalMonth > 1) {
            if ($naturalMonth == 1) {
                $naturalMonth = 13;
            }
            $result = self::getNaturalMonth(--$naturalMonth, $startTime, $format);
        }
        if ($format) {
            $naturalMonthArr[] = [
                date("Y-m-d 00:00:00", $startTime + 1),
                date("Y-m-d 23:59:59", $endTime)
            ];
        } else {
            $naturalMonthArr[] = [$startTime + 1, $endTime];
        }
        $naturalMonthArr = array_merge($naturalMonthArr, $result);
        return $naturalMonthArr;
    }


    /**
     * 推算自然周
     * 自然周:假如今天周二,我要取前2个自然周,则为 上周周一00:00:00 到今天晚上(周二)23:59:59  总计7+2 = 9天
     * @param int $naturalWeek  要推算的自然周数
     * @param null $time        从哪个时间开始推算  默认当前时间
     * @param bool $format      是否要格式化后的时间 默认时间戳
     * @return array
     */
    public static function getNaturalWeek($naturalWeek = 5, $time = null, $format = false)
    {
        if (empty($time)) {
            $time = time();
        }
        $naturalWeekArr = [];
        $weekArr        = [7, 1, 2, 3, 4, 5, 6];

        $currentTime = strtotime(date('Y-m-d 23:59:59', $time));
        $currentWeek = $weekArr[date("w", $currentTime)];

        $endTime   = $currentTime;
        $startTime = $endTime - (3600 * 24 * $currentWeek);

        $result = [];
        if ($naturalWeek > 1) {
            $result = self::getNaturalWeek(--$naturalWeek, $startTime, $format);
        }
        if ($format) {
            $naturalWeekArr[] = [
                date("Y-m-d 00:00:00", $startTime + 1),
                date("Y-m-d 23:59:59", $endTime)
            ];
        } else {
            $naturalWeekArr[] = [$startTime + 1, $endTime];
        }
        $naturalWeekArr = array_merge($naturalWeekArr, $result);
        return $naturalWeekArr;
    }


    /**
     * 推算自然日
     * @param int $naturalDay
     * @param null $todayTime
     * @param bool $format
     * @return array
     */
    public static function getNaturalDay($naturalDay = 6, $todayTime = null, $format = false)
    {
        if (empty($todayTime)) {
            $todayTime = time();
        }
        $naturalDayArr = [];
        for ($i = $naturalDay; $i >= 0; $i--) {
            if($format){
                $startTime       = date('Y-m-d 00:00:00', $todayTime - (86400 * $i));
                $endTime         = date('Y-m-d 23:59:59', $todayTime - (86400 * $i));
            }else{
                $startTime       = strtotime(date('Y-m-d 00:00:00', $todayTime - (86400 * $i)));
                $endTime         = strtotime(date('Y-m-d 23:59:59', $todayTime - (86400 * $i)));
            }
            $naturalDayArr[] = [$startTime, $endTime];
        }
        return $naturalDayArr;
    }