(PHP 5 >= 5.3.0)
DateTime::getTimestamp -- DateTimeImmutable::getTimestamp -- DateTimeInterface::getTimestamp -- date_timestamp_get — Gets the Unix timestamp
面向对象风格
过程化风格
Gets the Unix timestamp.
此函数没有参数。
Returns the Unix timestamp representing the date.
Example #1 DateTime::getTimestamp() example
面向对象风格
<?php
$date = new DateTime();
echo $date->getTimestamp();
?>
过程化风格
<?php
$date = date_create();
echo date_timestamp_get($date);
?>
以上例程的输出类似于：
1272509157
Using U as the parameter to DateTime::format() is an alternative when using PHP 5.2.
Justin Heesemann (2010-06-11 02:57:19)
Note that for dates before the unix epoch getTimestamp() will return false, whereas format("U") will return a negative number.
<?php
$date = new DateTime("1899-12-31");
// "-2209078800"
echo $date->format("U");
// false
echo $date->getTimestamp();
?>