Used to show last month and next month _php

/** * for showing last month and next month * @param int $sign 1: Last month 0: Indicates next month * @return string*/        functionGetMonth ($sign= "1"){            //to get the system in the month            $tmp _date=Date("Ym"); //cut out year            $tmp _year=substr($tmp _date, 0,4); //Cut out Month            $tmp _mon=substr($tmp _date, 4,2); $tmp _nextmonth=Mktime(0,0,0,$tmp _mon+1,1,$tmp _year); $tmp _forwardmonth=Mktime(0,0,0,$tmp _mon-1,1,$tmp _year); if($sign==0){                //get the next month of the current month                return $FM _next_month=Date("Ym",$tmp _nextmonth); }Else{                //get the last month of the current month                return $FM _forward_month=Date("Ym",$tmp _forwardmonth); }        }