DateTime::getTimestamp
DateTimeImmutable::getTimestamp
DateTimeInterface::getTimestamp
date_timestamp_get
(PHP 5 >= 5.3.0, PHP 7)
DateTime::getTimestamp -- DateTimeImmutable::getTimestamp -- DateTimeInterface::getTimestamp -- date_timestamp_get — Gets the Unix timestamp
说明
面向对象风格
过程化风格
$object
)Gets the Unix timestamp.
参数
此函数没有参数。
返回值
Returns the Unix timestamp representing the date.
范例
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
注释
Using U as the parameter to DateTime::format() is an alternative when using PHP 5.2.
参见
- DateTime::setTimestamp() - Sets the date and time based on an Unix timestamp
- DateTime::format() - Returns date formatted according to given format
用户评论:
[#1] heiccih at gmail dot com [2014-03-10 08:11:53]
In 32-bit system the unix timestamp will overflow if the date goes beyond year 2038 and this method will return false. In 64-bit systems this function will still work as intended. For more information please see http://en.wikipedia.org/wiki/Year_2038_problem.
[#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();
?>