php获取N天后的日期，排除周末与节假日加上调休日
代码如下.
/*** 求取从某日起经过一定天数后的日期,* 排除周六周日和节假日加上调休日* @param $start int|string 开始日期* @param $offset int 经过天数* @param $exception string|array 节假日* @param $allow string|array 调休日* @return string* examples:输入(-01-09,36,''),得到-03-09*/function getendday( $start='now', $offset=0, $exception='', $allow='' ){date_default_timezone_set('prc');//先计算不排除周六周日及节假日的结果if (is_numeric($start)){$starttime = $start;}else{$starttime = strtotime($start);}$endtime = $starttime + $offset * 24 * 3600;$end = date('Y-m-d', $endtime);//然后计算周六周日引起的偏移$weekday = date('w', $starttime);//得到星期值：0-6if ($weekday == 0){//0是星期天$weekday = 7;}$remain = $offset % 7;$newoffset = 2 * ($offset - $remain) / 7;//每一周需重新计算两天if ($remain > 0) {//周余凑整$tmp = $weekday + $remain;if ($tmp >= 7) {$newoffset += 2;} else if ($tmp == 6) {$newoffset += 1;}//考虑当前为周六周日的情况if ($weekday == 6) {$newoffset -= 1;} else if ($weekday == 7) {$newoffset -= 2;}}//再计算节假日引起的偏移if (is_array($exception)) {//多个节假日foreach ($exception as $day) {$tmp_time = strtotime($day);if ($tmp_time > $starttime && $tmp_time <= $endtime) {//在范围(a,b]内$weekday_t = date('w', $tmp_time);if ($weekday_t <= 5 && $weekday_t != 0) {//防止节假日与周末重复$newoffset += 1;}}}}else {//单个节假日if (!empty($exception)) {$tmp_time = strtotime($exception);if ($tmp_time > $starttime && $tmp_time <= $endtime) {$weekday_t = date('w', $tmp_time);if ($weekday_t <= 5 && $weekday_t != 0) {$newoffset += 1;}}}}//再计算调休日引起的偏移if (is_array($allow)) {//多个调休日foreach ($allow as $day) {$tmp_time = strtotime($day);if ($tmp_time > $starttime && $tmp_time <= $endtime) {//在范围(a,b]内$weekday_t = date('w', $tmp_time);//得到星期值：0-6if ($weekday_t == 6 || $weekday_t == 0) {//若调休日是星期六、星期日$newoffset -= 1;}}}}else {//单个调休日if (!empty($allow)) {$tmp_time = strtotime($allow);if ($tmp_time > $starttime && $tmp_time <= $endtime) {$weekday_t = date('w', $tmp_time);if ($weekday_t == 6 || $weekday_t == 0) {//若调休日是星期六、星期日$newoffset -= 1;}}}}//根据偏移天数，递归做等价运算if($newoffset > 0){#echo "[{$start} -> {$offset}] = [{$end} -> {$newoffset}]"."<br />n";return getendday($end,$newoffset,$exception,$allow);}else{return $end;}}
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