DateTime::diff

DateTimeImmutable::diff

DateTimeInterface::diff

date_diff

(PHP 5 >= 5.3.0, PHP 7)

DateTime::diff -- DateTimeImmutable::diff -- DateTimeInterface::diff -- date_diffReturns the difference between two DateTime objects

说明

面向对象风格

public DateTime::diff ( DateTimeInterface $targetObject [, bool $absolute = FALSE ] ) : DateInterval
public DateTimeImmutable::diff ( DateTimeInterface $targetObject [, bool $absolute = FALSE ] ) : DateInterval
public DateTimeInterface::diff ( DateTimeInterface $targetObject [, bool $absolute = FALSE ] ) : DateInterval

过程化风格

date_diff ( DateTimeInterface $originObject , DateTimeInterface $targetObject [, bool $absolute = FALSE ] ) : DateInterval

Returns 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 represents the difference between the two dates 或者在失败时返回 FALSE.

The return value more specifically represents the interval to apply to the original object ($this or $originObject) to arrive at the $targetObject. This process is not always reversible.

范例

Example #1 DateTime::diff() example

面向对象风格

<?php
$origin 
= new DateTime('2009-10-11');
$target = new DateTime('2009-10-13');
$interval $origin->diff($target);
echo 
$interval->format('%R%a days');
?>

过程化风格

<?php
$origin 
date_create('2009-10-11');
$target date_create('2009-10-13');
$interval date_diff($origin$target);
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。