(PHP 5 >= 5.3.0, PHP 7, PHP 8)
DateTime::diff -- DateTimeImmutable::diff -- DateTimeInterface::diff -- date_diff — Returns the difference between two DateTime objects
面向對象風(fēng)格
$targetObject, bool $absolute = false): DateInterval$targetObject, bool $absolute = false): DateInterval過(guò)程化風(fēng)格
$baseObject, DateTimeInterface $targetObject, bool $absolute = false): DateIntervalReturns the difference between two DateTimeInterface objects.
datetimeThe date to compare to.
absoluteShould the interval be forced to be positive?
The DateInterval object represents the
difference between the two dates 或者在失敗時(shí)返回 false.
The return value more specifically represents the interval to apply to the
original object ($this or
$originObject) to arrive at the
$targetObject. This process is not always
reversible.
示例 #1 DateTime::diff() example
面向對象風(fēng)格
<?php
$origin = new DateTime('2009-10-11');
$target = new DateTime('2009-10-13');
$interval = $origin->diff($target);
echo $interval->format('%R%a days');
?>
過(guò)程化風(fēng)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');
?>
以上例程會(huì )輸出：
+2 days
示例 #2 DateTime object comparison
注意:
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);
?>
以上例程會(huì )輸出：
bool(false) bool(true) bool(false)