DateTime::diff
DateTimeImmutable::diff
DateTimeInterface::diff
date_diff
(PHP 5 >= 5.3.0, PHP 7)
DateTime::diff -- DateTimeImmutable::diff -- DateTimeInterface::diff -- date_diff — Returns the difference between two DateTime objects
说明
面向对象风格
public DateTimeImmutable::diff
( DateTimeInterface
$datetime2
[, bool $absolute = FALSE
] ) : DateInterval
public DateTimeInterface::diff
( DateTimeInterface
$datetime2
[, bool $absolute = FALSE
] ) : DateInterval过程化风格
date_diff
( DateTimeInterface
$datetime1
, DateTimeInterface $datetime2
[, bool $absolute = FALSE
] ) : DateIntervalReturns the difference between two DateTimeInterface objects.
参数
-
datetime -
The date to compare to.
-
absolute -
Should the interval be forced to be positive?
返回值
The DateInterval object representing the
difference between the two dates 或者在失败时返回 FALSE.
范例
Example #1 DateTime::diff() example
面向对象风格
<?php
$datetime1 = new DateTime('2009-10-11');
$datetime2 = new DateTime('2009-10-13');
$interval = $datetime1->diff($datetime2);
echo $interval->format('%R%a days');
?>
过程化风格
<?php
$datetime1 = date_create('2009-10-11');
$datetime2 = date_create('2009-10-13');
$interval = date_diff($datetime1, $datetime2);
echo $interval->format('%R%a days');
?>
以上例程会输出：
+2 days
Example #2 DateTime object comparison
Note:
As of PHP 5.2.2, DateTime objects can be compared using comparison operators.
<?php
$date1 = new DateTime("now");
$date2 = new DateTime("tomorrow");
var_dump($date1 == $date2);
var_dump($date1 < $date2);
var_dump($date1 > $date2);
?>
以上例程会输出：
bool(false) bool(true) bool(false)
参见
- DateInterval::format() - Formats the interval
- DateTime::add() - 给一个 DateTime 对象增加一定量的天，月，年，小时，分钟 以及秒。
- DateTime::sub() - 对一个 DateTime 对象减去一定量的 日、月、年、小时、分钟和秒。