PHP获取指定是星期几

       //获取星期几
        function   wk($date1) {
        $datearr = explode("-",$date1);     //将传来的时间使用“-”分割成数组
        $year = $datearr[0];       //获取年份
        $month = sprintf('%02d',$datearr[1]);  //获取月份 
        $day = sprintf('%02d',$datearr[2]);      //获取日期
        $hour = $minute = $second = 0;   //默认时分秒均为0
        $dayofweek = mktime($hour,$minute,$second,$month,$day,$year);    //将时间转换成时间戳
        $shuchu = date("w",$dayofweek);      //获取星期值
        $weekarray=array("星期日","星期一","星期二","星期三","星期四","星期五","星期六"); 
        return $weekarray[$shuchu]; 
        }
        $time = date('Y-m-d',time());
        $totime = wk($time);
        echo $totime ;