PHP按周数获取一周的开始和结束日期

许多年前，我发现此功能：

function getStartAndEndDate($week, $year) {  $dto = new DateTime();  $dto->setISODate($year, $week);  $ret['week_start'] = $dto->format('Y-m-d');  $dto->modify('+6 days');  $ret['week_end'] = $dto->format('Y-m-d');  return $ret;}$week_array = getStartAndEndDate(52,2013);print_r($week_array);