标签：月份 targetLastDay 日期 length time date xx PHP day
function setMonth($time, $length){
// $time => 时间戳 $length => 加减几月(数字)
if (!is_numeric($time)) $time = strtotime($time);
if ($length > 0) $length = "+$length";
$hour = date(' H:i:s', $time);
$day = date('d', $time);
if ($day == '29' || $day == '30' || $day == '31') {
// 目标年月
$targetTime = strtotime(date('Y-m', $time) . " $length month");
$targetYearMonth = date('Y-m-', $targetTime);
// 目标月最后一天
$targetLastDay = date('t', $targetTime);
// 如果目标月最后一天大于等于 $day 则正常返回，否则返回目标月的最后一天
if ($targetLastDay >= $day) $targetLastDay = $day;
// 返回目标时间 格式:xxxx-xx-xx xx:xx:xx
return $targetYearMonth . $targetLastDay . $hour;
}
return date('Y-m-d H:i:s', strtotime("$length month", $time));}
标签：月份,
targetLastDay,
日期,
length,
time,
date,
xx,
PHP,
day
From： https://www.cnblogs.com/cuishilei/p/17762345.html