PHP returns nearly 7 days this month last month date

1<?PHP2 /**3 * Return nearly 7 days, month, month data4 * Regardless of the day (display background data dedicated)5  */6 functionWeekmonthlastmonth ($search _date= ' Week ') {7 8     Switch($search _date)9     {Ten          Case' Week '://nearly 7 days One             $start _date=Date("Y-m-d",Strtotime("-7 Days"))); A             $end _date=Date("Y-m-d",Strtotime("-1 Days"))); -              Break; -          Case' Month '://this month the             $start _date=Date("y-m-01",Strtotime("-1 Days"))); -             $end _date=Date("Y-m-d",Strtotime("-1 Days"))); -              Break; -          Case' Last_month '://last month +             $search _time=Strtotime("-1 month")); -             $start _date=Date("y-m-01",$search _time); +             $end _date=Date(' y-m-d ',Strtotime("$start _date+1 month-1 Day ")); A              Break; at     } -     return Array($start _date,$end _date); - } -  - Echo Print_r(Weekmonthlastmonth (' Week '),true); - Echo Print_r(Weekmonthlastmonth (' month '),true); in Echo Print_r(Weekmonthlastmonth (' Last_month '),true);

PHP returns nearly 7 days this month last month date