Calculate the interval from Monday to Friday within a year

//year
$year = date("Y");
$beninTime = mktime(0,0,0,1,1,$year);
$endTime = mktime(0 ,0,0,1,1,$year+1)-1;
$weekArray = array();
$isBegin = true;
$forTime = 0;
for ($time=$beninTime;$time<= $endTime;){
 $forTime++;
 $start = $end = 0;
 if($isBegin){
 //$nIndex==1 means Monday, $nIndex==7 means Sunday
 $nIndex = date( "N",$time);
 //$mulNum=1 means Monday is one day later,
 $mulNum = 0;
 switch ($nIndex){
 case 1: $mulNum =7; break;
 case 2 : $mulNum =6; break;
 case 3: $mulNum =5; break;
 case 4: $mulNum =4; break;
 case 5: $mulNum =3; break;
 case 6: $mulNum =2; break;
 case 7: $mulNum =1; break;
 }
 }else{
 //Week 1
 $mulNum = 7;
 }
 if($mulNum>2){
 $start = $time;
 / /Friday time
 $end = $time+($mulNum-2-1)*24*60*60;
 if($end>$endTime){
 $end = $endTime;
 }
 $weekArray[] = array(
 'start'=>$start,
 'end'=> $end,
 );
 if($end>=$endTime){
 break;
 }
 }
 $time += $mulNum *24*60*60;
 $isBegin = false;
}
echo $forTime.'';
foreach ($weekArray as $week){
 echo date("Y-m-d",$week[ 'start'])."week".date("N",$week['start']).">>>>>>".date("Y-m-d",$week[' end'])."week".date("N",$week['end']).'';
}
?>