How to get date based on year and week number in php

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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