传入 年份 和 本年的多少周，计算改周在本年的开始日期和结束日期
/** @Purpose : 根据所给年份和该年的第几周，得出该周在本年的开始日期和结束日期* @time : 2017/11/03 */ function getWeekStartAndEnd ($year,$week=1) {header("Content-type:text/html;charset=utf-8");date_default_timezone_set("Asia/Shanghai");$year = (int)$year;$week = (int)$week;//按给定的年份计算本年周总数$date = new DateTime;$date->setISODate($year, 53); // 参见 http://php.net/manual/zh/datetime.setisodate.php// 一年周的最大值为 52$weeks = max($date->format("W"),52); // $date->format("W") 将日期格式化为 周，//如果给定的周数大于周总数或小于等于0if($week>$weeks || $week<=0){return false;}//如果周数小于10if($week<10){$week = '0'.$week;}//当周起止时间戳$timestamp['start'] = strtotime($year.'W'.$week); // strtotime('2009W32');Get timestamp of 32nd week in 2009. 参见：http://cn2.php.net/manual/zh/function.strtotime.php $timestamp['end'] = strtotime('+1 week -1 day',$timestamp['start']);//当周起止日期$timeymd['start'] = date("Y-m-d",$timestamp['start']);$timeymd['end'] = date("Y-m-d",$timestamp['end']);//返回起始时间戳//return $timestamp;//返回日期形式return $timeymd;}$week_time = getWeekStartAndEnd(2017,10);var_dump($week_time);//array (size=2)// 'start' => string '2017-03-06' (length=10)// 'end' => string '2017-03-12' (length=10)
参考自：http://www.thinkphp.cn/topic/4491.html
