HP實現計算一年多少個星期，返回一個星期的開始時間和結束時間（可選返回時間戳或日期）

function getWeekStartAndEnd ($year,$week=1) {
    header("Content-type:text/html;charset=utf-8");
    date_default_timezone_set("Asia/Shanghai");
    $year = (int)$year;
    $week = (int)$week;
    //按给定的年份计算本年周总数
    $date = new DateTime;
    $date->setISODate($year, 53);
    $weeks = max($date->format("W"),52);
    //如果给定的周数大于周总数或小于等于0
    if($week>$weeks || $week<=0){
        return false;
    }
    //如果周数小于10
    if($week<10){
        $week = '0'.$week;
    }
    //当周起止时间戳
    $timestamp['start'] = strtotime($year.'W'.$week);
    $timestamp['end'] = strtotime(' 1 week -1 day',$timestamp['start']);
    //当周起止日期
    $timeymd['start'] = date("Y-m-d",$timestamp['start']);
    $timeymd['end'] = date("Y-m-d",$timestamp['end']);
    //返回起始时间戳
    return $timestamp;
    //返回日期形式
    //return $timeymd;
}

可選, 一個星期, 幾個