直接貼程式碼了

//時間相關
    public function timeinfo(){

        //獲取今天0點-24點時間戳
        $today = strtotime(date('Y-m-d', time()));
        $todayend = $today + 24 * 60 * 60;


        //獲取本週第一天及最後一天
        $weekfirst=strtotime(date('Y-m-d', strtotime('this week')));
        $weeklast=strtotime(date('Y-m-d', strtotime('last day next week'
 
)));

        //3.獲取當天年份、月份、日及天數.
        echo " 本月共有:".date("t")."天";
        echo " 當前年份".date('Y');
        echo " 當前月份".date('m');
        echo " 當前幾號".date('d');

        //1.獲取上個月第一天及最後一天.
        echo date('Y-m-01', strtotime('-1 month'));
        echo "<br/>";
        echo date('Y-m-t', strtotime('-1 month'
 
));

        //2016-08-10這天 2個月後的日期
        echo date("Y-m-d",strtotime("+2 month",strtotime("2016-08-10")));

        //獲取3 年、月、日 後的日期
        echo date("Y-m-d",strtotime("+3 year",time()));
        echo date("Y-m-d",strtotime("+3 month",time()));
        echo date("Y-m-d",strtotime("+3 day",time()));


    }

    //獲取當月第一天和最後一天
 

    function getthemonth($date)
    {
        $firstday = date('Y-m-01', strtotime(date('Y-m-d')));
        $lastday = date('Y-m-d', strtotime("$firstday +1 month -1 day"));
        return array($firstday,$lastday);
    }