思路：
3、计算需查询日期索引
4、获得查询日期
/*创建日期类型记录表格*/
CREATE TABLE `tb_workday` (
`did` int(11) NOT NULL AUTO_INCREMENT,
`exact_date` varchar(32) NOT NULL COMMENT '具体日期：格式date("Ymd");(20170205)',
`date_year` varchar(32) NOT NULL COMMENT '具体日期：格式date("Y");(2017)',
`date_type` tinyint(2) NOT NULL COMMENT '日期类型：0、工作日；1、特殊工作日；2、法定节假日',
PRIMARY KEY (`did`)
) ENGINE=InnoDB AUTO_INCREMENT=829 DEFAULT CHARSET=utf8 COMMENT='各年工作日&法定节假日数据'
PHP
class work_days
{
/**
* 获取星期
* @param $date
* @return mixed
*/
function get_week($date)
{
//强制转换日期格式
$date_str = date('Y-m-d',strtotime($date));
//封装成数组
$arr = explode("-",$date_str);
//参数赋值
//年
$year = $arr[0];
//月，输出2位整型，不够2位右对齐
$month = sprintf('%02d',$arr[1]);
//日，输出2位整型，不够2位右对齐
$day = sprintf('%02d',$arr[2]);
//时分秒默认赋值为0；
$hour = $minute = $second = 0;
//转换成时间戳
$strap = mktime($hour,$minute,$second,$month,$day,$year);
//获取数字型星期几
$number_wk = date("w",$strap);
//获取数字对应的星期
return $number_wk;
//自定义星期数组
//$weekArr = array("星期日","星期一","星期二","星期三","星期四","星期五","星期六");
//获取数字对应的星期
//return $weekArr[$number_wk];
}
/**
* 获取指定日期段内每一天的日期
* @param string $startdate 开始日期
* @param string $enddate 结束日期
* @return array
*/
function getDateFromRange($startdate,$enddate)
{
$stimestamp = strtotime($startdate);
$etimestamp = strtotime($enddate);
// 计算日期段内有多少天
$days = ($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;
}
/**
* 更新数据库指定年份日期数据
* @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';//自行查找的免费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($dateData);
//工作日 判断是否为周末
if (in_array(self::get_week($_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($dateData);
}
}
//法定节假日
if ($_ret_curl['data'] == 2) {
$dateData['exact_date'] = $_date;
$dateData['date_year'] = $year;
$dateData['date_type'] = 2;
$_ret = $m->add($dateData) ? 1 : 0;
unset($dateData);
}
//休息日(周末) 暂不处理
/*if ($_ret_curl['data'] == 1) {
}*/
$_ret && $count++;
unset($_date,$_post_data,$_ret_curl,$_ret);
}
return $count;
}
/**
* 获取当年所有工作日 (从数据库获取，数据库无数据则先更新数据)
* @param string $year 当年年份
* @return array
*/
private function getWorkDays($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 {
//更新数据库工作日数据
$ret = self::updateDate($year);
if ($ret > 0) {
return self::getWorkDays($year);
} else {
return false;
}
}
}
/**
* 获取开始日期后第N个工作日具体日期
* @param $startdate string 计算开始日期 需包含年月日信息
* @param $days int 间隔天数
* @return mixed 成功返回 对应日期，失败返回false
*/
public function getNextWorkDate($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) {//查询日期为非工作
$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 {
//查询日期已跨年
$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
