1. 时间“2020-05-12 09:00:00”，加一个月
$time1 = strtotime("2020-05-12 09:00:00");
echo date( "Y-m-d H:i:s", strtotime( "+1 months", $time1 ) );//2020-06-12 09:00:00[正确]
2. 时间“2020-01-31 09:00:00”，加一个月
$time2 = strtotime("2020-01-31 09:00:00");
echo date( "Y-m-d H:i:s", strtotime( "+1 month", $time2 ) );//2020-03-02 09:00:00[错误]
解决办法：
function get_date($timeDate,$time)
{
//智能的判断一个月份的最后一天是几号 first day of/last day of -1 month
echo date("Y-m-d H:i:s", strtotime($timeDate." last day of {$time}"));
}
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