(PHP 8 >= 8.4.0)
DateTimeImmutable::setMicrosecond — Sets microsecond part of the time
$microsecond): staticReturns a new DateTimeImmutable object constructed from the old one, with modified microsecond part.
microsecond0 to 999999).
返回带有修改数据的新 DateTimeImmutable 对象。
If the microsecond is outside the range [0, 999999],
a DateRangeError is thrown.
示例 #1 DateTimeImmutable::setMicrosecond() example
<?php
$date = DateTimeImmutable::createFromTimestamp(123.456789);
echo $date->format('Y-m-d H:i:s.u') . PHP_EOL;
$date = $date->setMicrosecond(987654);
echo $date->format('Y-m-d H:i:s.u') . PHP_EOL;
?>以上示例会输出：
1970-01-01 00:02:03.456789 1970-01-01 00:02:03.987654