指定月份的第某个月
最后更新于：2022-04-02 02:19:02
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### 函数
```
function getAfterMonth($newMonth, $num){
$nowMonth = date('Y-m-d H:i:s', strtotime($newMonth."01"));
$timestamp = strtotime("{$nowMonth} -$num month");
$newMonth = date('Ym', $timestamp);
return $newMonth;
}
echo getAfterMonth('202001','0').PHP_EOL; // 202001
echo getAfterMonth('202001','1').PHP_EOL; // 201912
echo getAfterMonth('202001','2').PHP_EOL; // 201911
```
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