//获取前6个月月份

    public  function to_sex_month(){

        $today = input('param.today') ? input('param.today') : date("Y-m-d");

        $arr = array();

        $old_time = strtotime('-6 month',strtotime($today));

        for($i = 0;$i <= 6; ++$i){

            $t = strtotime("+$i month",$old_time);

            $arr[]=date('Y-m',$t);

        }

        return $arr;

    }

    //获取前6天日期

    public  function to_sex_day(){

        $today = input('param.today') ? input('param.today') : date("Y-m-d");

        $arr = array();

        $old_time = strtotime('-6 day',strtotime($today));

        for($i = 0;$i <= 6; ++$i){

            $t = strtotime("+$i day",$old_time);

            $arr[]=date('Y-m-d',$t);

        }

        return $arr;

    }