PHP에서 연도와 주를 기준으로 날짜를 얻는 방법

function getWeekDate($year,$weeknum){
  $firstdayofyear=mktime(0,0,0,1,1,$year);
  $firstweekday=date('N',$firstdayofyear);
  $firstweenum=date('W',$firstdayofyear);
  if($firstweenum==1){
      $day=(1-($firstweekday-1)) 7*($weeknum-1);
      $startdate=date('Y-m-d',mktime(0,0,0,1,$day,$year));
      $enddate=date('Y-m-d',mktime(0,0,0,1,$day 6,$year));
  }else{
      $day=(9-$firstweekday) 7*($weeknum-1);
      $startdate=date('Y-m-d',mktime(0,0,0,1,$day,$year));
      $enddate=date('Y-m-d',mktime(0,0,0,1,$day 6,$year));
  }
  return array($startdate,$enddate);
}
?>

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