PHP实现星期X转换时间戳函数

<?
function getTimeFromWeek($dayNum){
    //$dayNum:0-6
    $curDayNum=date("w");
    if($dayNum>$curDayNum) $timeFlag="last ";
    elseif($dayNum==$curDayNum) $timeFlag="";
    //如果要本周星期X未到时用本周的星期X else $timeFlag="next";
    else $timeFlag="last ";//本周星期X未到时用上周的星期X(让数据不为空)
    $arryWeekDay = array('Sunday','Monday','Tuesday','Wednesday','Thursday','Friday','Saturday');
    $timeStamp=strtotime("$timeFlag"."$arryWeekDay[$dayNum]");
    return $timeStamp;
       
}

echo date("Y-m-d l",getTimeFromWeek(0));echo "<br>";
echo date("Y-m-d l",getTimeFromWeek(1));echo "<br>";
echo date("Y-m-d l",getTimeFromWeek(2));echo "<br>";
echo date("Y-m-d l",getTimeFromWeek(3));echo "<br>";
echo date("Y-m-d l",getTimeFromWeek(4));echo "<br>";
echo date("Y-m-d l",getTimeFromWeek(5));echo "<br>";
echo date("Y-m-d l",getTimeFromWeek(6));echo "<br>";