php 日历

/*

 * 参数param_begin_week 日历以周几开始 周日 0  周一到周六为1-6

 * */

function days($day_start_str, $day_end_str, $param_begin_week = 0)

{

    $timestamp_start = is_integer($day_start_str) ? $day_start_str : strtotime($day_start_str);

    $timestamp_end = is_integer($day_end_str) ? $day_end_str : strtotime($day_end_str);

    $year_start = date("Y", $timestamp_start);

    $month_start = date("n", $timestamp_start);

    $year_end = date("Y", $timestamp_end);

    $dates = [];

 

    for ($year = $year_start; $year <= $year_end; ++$year) {

        if ($year < $year_end) {

            $month_end = 12;

        } else {

            $month_end = date("n", $timestamp_end);

        }

        for ($month = $month_start; $month <= $month_end; ++$month) {

            $day_end = date("t", mktime(0, 0, 0, $month, 1, $year));

 

            //1号之前位置补空

            $week_of_first = date("w", mktime(0, 0, 0, $month, 1, $year));

            $space_num = $week_of_first - $param_begin_week;

            $space_num = $space_num >= 0 ? $space_num : 7 + $space_num;

            for ($s = 0; $s < $space_num; $s++) {

                $dates[$year][$month][] = '';

            }

            //当月日期

            for ($day = 1; $day <= $day_end; ++$day) {

                $dates[$year][$month][] = $day;

            }

            //当月最后一天之后位置补空

            $week_of_last = date("w", mktime(0, 0, 0, $month, $day_end, $year));

            $space_num = $param_begin_week - $week_of_last + -1;

            $space_num = $space_num >= 0 ? $space_num : 7 + $space_num;

            for ($s = 0; $s < $space_num; $s++) {

                $dates[$year][$month][] = '';

            }

        }

        $month_start = 1;

    }

    return $dates;

}