/*創建日期類型記錄表格*/CREATE TABLE `tb_workday` (`did` int(11) NOT NULL AUTO_INCREMENT,`exact_date` varchar(32) NOT NULL COMMENT '具體日期：格式date("Ymd");(20170205)',`date_year` varchar(32) NOT NULL COMMENT '具體日期：格式date("Y");(2017)',`date_type` tinyint(2) NOT NULL COMMENT '日期類型：0、工作日；1、特殊工作日；2、法定節假日',PRIMARY KEY (`did`)) ENGINE=InnoDB AUTO_INCREMENT=829 DEFAULT CHARSET=utf8 COMMENT='各年工作日&法定節假日數據'

<?php class work_days{ /**  * 獲取星期  * @param $date  * @return mixed  */ function get_week($date) {  //強制轉換日期格式  $date_str = date('Y-m-d', strtotime($date));  //封裝成數組  $arr = explode("-", $date_str);  //參數賦值  //年  $year = $arr[0];  //月，輸出2位整型，不夠2位右對齊  $month = sprintf('%02d', $arr[1]);  //日，輸出2位整型，不夠2位右對齊  $day = sprintf('%02d', $arr[2]);  //時分秒默認賦值為0；  $hour = $minute = $second = 0;  //轉換成時間戳  $strap = mktime($hour, $minute, $second, $month, $day, $year);  //獲取數字型星期幾  $number_wk = date("w", $strap);   //獲取數字對應的星期  return $number_wk;   //自定義星期數組  //$weekArr = array("星期日", "星期一", "星期二", "星期三", "星期四", "星期五", "星期六");   //獲取數字對應的星期  //return $weekArr[$number_wk]; }   /**  * 獲取指定日期段內每一天的日期  * @param string $startdate 開始日期  * @param string $enddate  結束日期  * @return array  */ function getDateFromRange($startdate, $enddate) {  $stimestamp = strtotime($startdate);  $etimestamp = strtotime($enddate);   // 計算日期段內有多少天  $days = ($etimestamp - $stimestamp) / 86400 + 1;   // 保存每天日期  $_list_date = array();  for ($i = 0; $i < $days; $i++) {   $_list_date[] = date('Y-m-d', $stimestamp + (86400 * $i));  }  return $_list_date; }  function curl_post($url, $data = null) {  $curl = curl_init();  curl_setopt($curl, CURLOPT_URL, $url);  curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, FALSE);  curl_setopt($curl, CURLOPT_SSL_VERIFYHOST, FALSE);  if (!empty($data)) {   curl_setopt($curl, CURLOPT_POST, 1);   curl_setopt($curl, CURLOPT_POSTFIELDS, $data);  }  curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1);  $output = curl_exec($curl);  curl_close($curl);  return $output; }  /**  * 更新數據庫指定年份日期數據  * @param $year  * @return int  */ function updateDate($year) {  $startDate = date('Y-m-d', strtotime($year . '-01-01'));  $endDate = date('Y-m-d', strtotime('+1 year', strtotime($startDate)) - 86400);  $_list_date = self::getDateFromRange($startDate, $endDate);   $url = 'http://api.goseek.cn/Tools/holiday';//自行查找的免費API   $m = M('tb_workday');  $count = 0;   foreach ($_list_date as $k => $_date) {   $_ret = 0;   $_date = date('Ymd', strtotime($_date));   $_post_data = array('date' => $_date);   $_ret_curl = curl_post($url, $_post_data);   $_ret_curl = json_decode($_ret_curl, true);    //工作日   if ($_ret_curl['data'] == 0) {    $dateData['exact_date'] = $_date;    $dateData['date_year'] = $year;    $dateData['date_type'] = 0;    $_ret = $m->add($dateData) ? 1 : 0;    unset($dateData);      //工作日 判斷是否為周末    if (in_array(self::get_week($_date), array(0, 1))) {     //特殊工作日     $dateData['exact_date'] = $_date;     $dateData['date_year'] = $year;     $dateData['date_type'] = 1;     $_ret = $m->add($dateData) ? 1 : 0;     unset($dateData);    }   }    //法定節假日   if ($_ret_curl['data'] == 2) {    $dateData['exact_date'] = $_date;    $dateData['date_year'] = $year;    $dateData['date_type'] = 2;    $_ret = $m->add($dateData) ? 1 : 0;    unset($dateData);   }    //休息日(周末) 暫不處理   /*if ($_ret_curl['data'] == 1) {    }*/   $_ret && $count++;   unset($_date, $_post_data, $_ret_curl, $_ret);  }  return $count; }  /**  * 獲取當年所有工作日 (從數據庫獲取，數據庫無數據則先更新數據)  * @param string $year 當年年份  * @return array  */ private function getWorkDays($year) {  $m = M('tb_workday');  $map['date_year'] = $year;  $map['date_type'] = 0;  $DateArray = $m->field('exact_date')->where($map)->select();  if (!empty($DateArray)) {   $DateArray = array_column($DateArray, 'exact_date');   return $DateArray;  } else {   //更新數據庫工作日數據   $ret = self::updateDate($year);   if ($ret > 0) {    return self::getWorkDays($year);   } else {    return false;   }  } }  /**  * 獲取開始日期后第N個工作日具體日期  * @param $startdate string 計算開始日期 需包含年月日信息  * @param $days   int 間隔天數  * @return mixed 成功返回 對應日期，失敗返回false  */ public function getNextWorkDate($startdate, $days) {  $year = date('Y', strtotime($startdate));  $startdate = date('Y-m-d', strtotime($startdate));   $workDays = $this->getWorkDays($year);   $search_key = array_search(date('Ymd', strtotime($startdate)), $workDays);   if ($search_key === false) {//查詢日期為非工作   //獲取查詢日期前最近工作日   $m = M('tb_workday');   $map['date_year'] = $year;   $map['date_type'] = 0;   $map['DATE_FORMAT(`exact_date`,/'%Y-%m-%d/')'] = array('LT', $startdate);   $_search_date = $m->where($map)->order('`exact_date` DESC')->getField('exact_date');   $search_key = array_search($_search_date, $workDays);   unset($m, $map, $_search_date);  }   $t_key = $search_key + $days;   if ($t_key <= count($workDays) - 1) {   return date('Y-m-d', strtotime($workDays[$t_key]));  } else {   //查詢日期已跨年   $n_days = $days - (count($workDays) - 1 - $search_key);   $next_year = $year + 1;   return $this->getNextWorkDate($next_year . '-01-01', $n_days - 1);  } }}  $startdate = '2018-09-28';$days = 5; $class = new work_days();$_date_workday = $class->getNextWorkDate($startdate, $days);echo $_date_workday;//2018-10-10