数据统计获取一年 有多少个自然周，起止时间，当前是第几个周
2024-05-13 16:27:41
最近在做大数据统计分析需求，经常会用到一些统计，比如，周统计，环比等 ，下面我们来计算一年有多少个 自然 周，直接上代码吧：
/*** 获取一年每周的开始日期和结束日期* @param $year* @return array*/public function get_week($year){$whole_week = $this->get_big_week($year);//获取最大周数$str = '';for ($i = 1; $i <= $whole_week; $i++) {$str .= $i . ',';}$str_arr = explode(',', rtrim($str, ','));//转成数组$week_list = array();foreach ($str_arr as $key => $value) {$week = $this->get_year_month_week($year, $value);//一周的日期$week_list[$value] = [0 => $week[0],1 => $week[6],];}$firstWeek = $week_list[1];// 第一周$firstWeekDay = date('d',strtotime($firstWeek[0]));$firstYear = date('Y',strtotime($firstWeek[0]));$endYear = date('Y',strtotime($firstWeek[1]));$addWeek = $newWeekList = [];if($firstWeekDay > 1){if($firstYear != $endYear){ //跨年$week_list[1][0]= date('Y-m-d' ,mktime(0, 0, 0, 1,1, date($year)));$newWeekList = $week_list;} else { //不跨年$addWeek = [0 => date('Y-m-d' ,mktime(0, 0, 0, 1,1, date($year))),1 => date('Y-m-d', strtotime($firstWeek[0]) - 24 *3600),];$newWeekList = $this->add_week($addWeek, $week_list);}} else {$newWeekList = $week_list;}$endWeek = end($newWeekList);// 最后一周$endWeekYear = date('Y',strtotime($endWeek[1]));$startWeekYear = date('Y',strtotime($endWeek[0]));$currentYear = date('Y',time());if($endWeekYear != $currentYear){ //跨年了$lastday = date("Y-m-t", strtotime('next month', strtotime("{$currentYear}-11-01")));$weekNum = count($newWeekList);foreach($newWeekList as $key=>&$week){if($weekNum == $key){$week[1] = $lastday;}}$endWeek[1] = date('Y-m-t', strtotime($year."-12-01"));}$weekNum = count($newWeekList);$newWeekList[$weekNum][1] = date('Y-m-t', strtotime($year."-12-01"));return $newWeekList;}public function add_week($addWeek, $week_list){if(!$addWeek) return $week_list;$newWeekList = [];$week_list = array_merge([$addWeek],$week_list);foreach($week_list as $key=>$week){$newWeekList[$key+1] = $week;}return $newWeekList;}public function get_date($return, $string, $date){if (empty($return)) {$return = "Y-m-d";}if (empty($string)) {$string = "now";}if (empty($date)) {$date = time();} else {$date = strtotime(date($date));}if (preg_match("/month/", $string)) {$first_day_of_month = date('Y-m', $date) . '-01';$str_date = strtotime($first_day_of_month);}if (preg_match("/month/", $string)) {$l_date = date("Y-m-d", strtotime($string, $str_date));$day = substr(date("Y-m-d", $date), 8, 2);if (substr($l_date, 0, 7) . '-' . date('t', strtotime(substr($l_date, 0, 7))) < substr($l_date, 0, 7) . '-' . $day) {$l_date = substr($l_date, 0, 7) . '-' . date('t', strtotime(substr($l_date, 0, 7)));} else {$l_date = substr($l_date, 0, 7) . '-' . $day;}$l_date = date($return, strtotime($l_date));return $l_date;} else {return date($return, strtotime($string, $date));}}public function get_big_week($year_now){$big_week = $this->get_date("W", NULL, $year_now . '-12-31');if ($big_week == 1) {$big_week = $this->get_date("W", NULL, $year_now . '-12-30');}if ($big_week == 1) {$big_week = $this->get_date("W", NULL, $year_now . '-12-29');}if ($big_week == 1) {$big_week = $this->get_date("W", NULL, $year_now . '-12-28');}if ($big_week == 1) {$big_week = $this->get_date("W", NULL, $year_now . '-12-27');}if ($big_week == 1) {$big_week = $this->get_date("W", NULL, $year_now . '-12-26');}if ($big_week == 1) {$big_week = $this->get_date("W", NULL, $year_now . '-12-25');}if ($big_week == 1) {$big_week = $this->get_date("W", NULL, $year_now . '-12-24');}return $big_week;}public function get_year_month_week($year_now, $week_now){//指定年和周的日期数组$time = new \DateTime();$time->setISODate($year_now, $week_now, 1);$result[] = $time->format('Y-m-d');$time->setISODate($year_now, $week_now, 2);$result[] = $time->format('Y-m-d');$time->setISODate($year_now, $week_now, 3);$result[] = $time->format('Y-m-d');$time->setISODate($year_now, $week_now, 4);$result[] = $time->format('Y-m-d');$time->setISODate($year_now, $week_now, 5);$result[] = $time->format('Y-m-d');$time->setISODate($year_now, $week_now, 6);$result[] = $time->format('Y-m-d');$time->setISODate($year_now, $week_now, 7);$result[] = $time->format('Y-m-d');return $result;}/*** 获取当前周的起止时间* @param $currentWeek* @param $weeklist* @return int|string*/public function setCurrentWeek($currentWeek, $weeklist) {if(!$weeklist || !$currentWeek) return 1;$week_start = $currentWeek['week_start'];foreach($weeklist as $key=>$week){if($week_start == $week[0]){return $key;}}}/*PHP获取当前日期是第几周和本周开始日期和本周结束日期*/public function getNowTimeInfo($now) {$str = array();//$first =1 表示每周星期一为开始日期 0表示每周日为开始日期$str['year'] = date('Y', strtotime($now));$first = 1;//当日在整年中的第几周$str['week'] = date('W', strtotime($now));//获取当前周的第几天 周日是 0 周一到周六是 1 - 6$w = date('w', strtotime($now));//获取本周开始日期，如果$w是0，则表示周日，减去 6 天$week_start = date('Y-m-d', strtotime("$now -" . ($w ? $w - $first : 6) . ' days'));$str['week_start'] = $week_start;//本周结束日期$week_end = date('Y-m-d', strtotime("$week_start +6 days"));$str['week_end'] = $week_end;return $str;}这样我们就可以获取当前是第几周，以及起止时间：
$weekFormat = new WeekFormatLogic();$date = date("Y-m-d",time());$currentWeek = $weekFormat->getNowTimeInfo($date);$year = date("Y",time());$weeklist = $weekFormat->get_week($year);return $weekFormat->setCurrentWeek($currentWeek, $weeklist);可以看到当前是滴29周：
起止时间为：
Array
([week_start] => 2021-07-12[week_end] => 2021-07-18
)
全部周的起止时间：
Array
([1] => Array([0] => 2021-01-01[1] => 2021-01-03)[2] => Array([0] => 2021-01-04[1] => 2021-01-10)[3] => Array([0] => 2021-01-11[1] => 2021-01-17)[4] => Array([0] => 2021-01-18[1] => 2021-01-24)[5] => Array([0] => 2021-01-25[1] => 2021-01-31)[6] => Array([0] => 2021-02-01[1] => 2021-02-07)[7] => Array([0] => 2021-02-08[1] => 2021-02-14)[8] => Array([0] => 2021-02-15[1] => 2021-02-21)[9] => Array([0] => 2021-02-22[1] => 2021-02-28)[10] => Array([0] => 2021-03-01[1] => 2021-03-07)[11] => Array([0] => 2021-03-08[1] => 2021-03-14)[12] => Array([0] => 2021-03-15[1] => 2021-03-21)[13] => Array([0] => 2021-03-22[1] => 2021-03-28)[14] => Array([0] => 2021-03-29[1] => 2021-04-04)[15] => Array([0] => 2021-04-05[1] => 2021-04-11)[16] => Array([0] => 2021-04-12[1] => 2021-04-18)[17] => Array([0] => 2021-04-19[1] => 2021-04-25)[18] => Array([0] => 2021-04-26[1] => 2021-05-02)[19] => Array([0] => 2021-05-03[1] => 2021-05-09)[20] => Array([0] => 2021-05-10[1] => 2021-05-16)[21] => Array([0] => 2021-05-17[1] => 2021-05-23)[22] => Array([0] => 2021-05-24[1] => 2021-05-30)[23] => Array([0] => 2021-05-31[1] => 2021-06-06)[24] => Array([0] => 2021-06-07[1] => 2021-06-13)[25] => Array([0] => 2021-06-14[1] => 2021-06-20)[26] => Array([0] => 2021-06-21[1] => 2021-06-27)[27] => Array([0] => 2021-06-28[1] => 2021-07-04)[28] => Array([0] => 2021-07-05[1] => 2021-07-11)[29] => Array([0] => 2021-07-12[1] => 2021-07-18)[30] => Array([0] => 2021-07-19[1] => 2021-07-25)[31] => Array([0] => 2021-07-26[1] => 2021-08-01)[32] => Array([0] => 2021-08-02[1] => 2021-08-08)[33] => Array([0] => 2021-08-09[1] => 2021-08-15)[34] => Array([0] => 2021-08-16[1] => 2021-08-22)[35] => Array([0] => 2021-08-23[1] => 2021-08-29)[36] => Array([0] => 2021-08-30[1] => 2021-09-05)[37] => Array([0] => 2021-09-06[1] => 2021-09-12)[38] => Array([0] => 2021-09-13[1] => 2021-09-19)[39] => Array([0] => 2021-09-20[1] => 2021-09-26)[40] => Array([0] => 2021-09-27[1] => 2021-10-03)[41] => Array([0] => 2021-10-04[1] => 2021-10-10)[42] => Array([0] => 2021-10-11[1] => 2021-10-17)[43] => Array([0] => 2021-10-18[1] => 2021-10-24)[44] => Array([0] => 2021-10-25[1] => 2021-10-31)[45] => Array([0] => 2021-11-01[1] => 2021-11-07)[46] => Array([0] => 2021-11-08[1] => 2021-11-14)[47] => Array([0] => 2021-11-15[1] => 2021-11-21)[48] => Array([0] => 2021-11-22[1] => 2021-11-28)[49] => Array([0] => 2021-11-29[1] => 2021-12-05)[50] => Array([0] => 2021-12-06[1] => 2021-12-12)[51] => Array([0] => 2021-12-13[1] => 2021-12-19)[52] => Array([0] => 2021-12-20[1] => 2021-12-26)[53] => Array([0] => 2021-12-27[1] => 2021-12-31))当然了，这里计算的时候是从元旦开始计算的，起止周可能不满足7天，中间其他的周都是正常的
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