时间判断 当前时间 按月份设置vip

function nextDay($date,$month){
    //1获取今天的时间  $date 时间     $date_day 今天的日期
    $date_day =date('d', strtotime($date));
    //2获取N月后的时间
    $lastday = strtotime("$date +$month months");
    $last_day =date('d',$lastday);
    $day_benlastday = date('Y-m-d', $lastday);
     $day_t=date('Y-m-t',strtotime("$day_benlastday -1 month"));
     $day_benlast_day= date('t',strtotime($day_t));
    //获取当天日期
    $Same_day = date('d', strtotime($date));
    //判断N月后的天数是否比当前时间小 
    if($day_benlastday<$Same_day &&$last_day!==$date_day){
        $day = $day_benlast_day;
        $day = date('Y',$lastday).'-'.date('m',strtotime($day_t)).'-'.$day.' 23:59:59';
    }else{
        $day = $Same_day;
        $day = date('Y',$lastday).'-'.date('m',$lastday).'-'.$day.' 23:59:59';
        
    }
    
    
    return $day;
 
}



echo nextDay('2020-01-30 05:05:05',1);