Laravel中使用Carbon时间类生成日历

日历从星期日开始，通过确定每月第一天所在的星期，计算前后日期。

    public function calendar(Request $request)
    {
        //获取年
        $year = $request->input('year', now()->year);
        //获取月份
        $month     = $request->input('month', now()->month);
        $yearMonth = sprintf("%d-%s", $year, $month);
        //获取月份第一天所在的星期
        $firstDayOfWeek = Carbon::parse("$yearMonth-01")->dayOfWeek;

        //补全
        $day      = 0;
        $calendar = [];
        for ($i = 0; $i < 6; $i++) {
            for ($j = 0; $j < 7; $j++) {
                if ($firstDayOfWeek != 0 and $i == 0) {
                    //根据月初第一天所在的星期，计算出之前几天的日子
                    $day  = Carbon::parse("$yearMonth-01")->subDays($firstDayOfWeek - $j)->day;
                    $date = Carbon::parse("$yearMonth-01")->subDays($firstDayOfWeek - $j)->format("Y-m-d");
                } else {
                    $day++;
                    $date = Carbon::parse("$yearMonth-01")->addDays($day - 1)->format("Y-m-d");
                }
                $calendar[$i][] = $date;
            }
        }

        return $calendar;
    }

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