1年間の月曜日から金曜日までの間隔を計算します

//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){
 //$nIndex==1 は月曜日、$nIndex==7 は日曜日を意味します
 $nIndex = date( " N",$time);
 //$mulNum=1 は月曜日が 1 日後であることを意味します,
 $mulNum = 0;
 switch ($nIndex){
 case 1: $mulNum =7; Break;
 case 2 : $ mulNum =6; ブレーク;
 ケース 3: $mulNum =5; ブレーク;
 ケース 5: $mulNum =3; ブレーク;
 ケース 7: $mulNum =1; Break;
 }
 }else{
 //第 1 週
 $mulNum = 7;
 }
 if($mulNum>2){
 $start = $time;
 / /金曜日時間
 $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']).'';
}
?>