计算一年内周一到周五的间隔区间

<?php
//年
$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){
		//$nIndex==1表示星期一，$nIndex==7表示星期日
		$nIndex = date("N",$time);
		//$mulNum=1表示过1天就是星期一，
		$mulNum = 0;
		switch ($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{
		//周1
		$mulNum = 7;
	}
	if($mulNum>2){
		$start = $time;
		//周五时间
		$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 $forTime.'<br/>';
foreach ($weekArray as $week){
	echo date("Y-m-d",$week['start'])."星期".date("N",$week['start']).">>>>>>".date("Y-m-d",$week['end'])."星期".date("N",$week['end']).'<br/>';
}
?>