如何比较 PHP 5.2.8 中的两个 DateTime 对象？
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How do I compare two DateTime objects in PHP 5.2.8?
提问by RedBlueThing
Having a look on the PHP documentation, the following two methods of the DateTimeobject would both seem to solve my problem:
查看 PHP 文档，DateTime对象的以下两种方法似乎都可以解决我的问题：
- DateTime::diff: Get the difference and use that to determine which is more ancient.
- DateTime::getTimestamp: Get the UNIX timestampt and compare those.
- DateTime::diff：获取差异并使用它来确定哪个更古老。
- DateTime::getTimestamp：获取 UNIX 时间戳并进行比较。
Both these methods are marked in the docoas being available in version >= 5.3 (and, not surprisingly, if I try to call them I find they don't exist). I can't find any specific documentation for 5.2.8 so I am not sure if there are equivalent methods in my version. I have Googledthe problem and found an eclectic range of solutions, none of which answer my very simple requirements:
这两种方法在doco 中都标记为在版本 >= 5.3 中可用（并且，毫不奇怪，如果我尝试调用它们，我会发现它们不存在）。我找不到 5.2.8 的任何特定文档，所以我不确定我的版本中是否有等效的方法。我在谷歌上搜索了这个问题并找到了一系列不拘一格的解决方案，但没有一个能满足我非常简单的要求：
- How do I compare two DateTime objects?
- Where can I find the doco for previous PHP versions? Specifically version 5.2.8?
- 如何比较两个 DateTime 对象？
- 在哪里可以找到以前 PHP 版本的 doco？特别是5.2.8版？
For some context, I have the following code:
对于某些上下文，我有以下代码：
$st_dt = new DateTime(verifyParam ('start_date'));
$end_dt = new DateTime(verifyParam ('end_date'));
// is the end date more ancient than the start date?
if ($end_dt < $start_dt)
Apparently there is no comparison operator on this guy.
显然这个人没有比较运算符。
Edit
编辑
Apparentlymy assumptions were completely false (thanks Milen for illustrating this so effectively). There is a comparison operator and it works just fine thanks. Sometimes I really miss a compiler. The bug is in the code above, I am sure you will find it much faster than I did :).
显然我的假设是完全错误的（感谢 Milen 如此有效地说明了这一点）。有一个比较运算符，它工作得很好，谢谢。有时我真的很想念一个编译器。错误在上面的代码中，我相信你会发现它比我做的要快得多:)。
回答by Milen A. Radev
The following seems to confirm that there are comparison operators for the DateTime class:
以下似乎证实了 DateTime 类有比较运算符：
dev:~# php
<?php
date_default_timezone_set('Europe/London');
$d1 = new DateTime('2008-08-03 14:52:10');
$d2 = new DateTime('2008-01-03 11:11:10');
var_dump($d1 == $d2);
var_dump($d1 > $d2);
var_dump($d1 < $d2);
?>
bool(false)
bool(true)
bool(false)
dev:~# php -v
PHP 5.2.6-1+lenny3 with Suhosin-Patch 0.9.6.2 (cli) (built: Apr 26 2009 20:09:03)
Copyright (c) 1997-2008 The PHP Group
Zend Engine v2.2.0, Copyright (c) 1998-2008 Zend Technologies
dev:~#
回答by Roberto Alonso
From the official documentation:
从官方文档：
As of PHP 5.2.2, DateTime objects can be compared using comparison operators.
$date1 = new DateTime("now");
$date2 = new DateTime("tomorrow");
var_dump($date1 == $date2); // false
var_dump($date1 < $date2); // true
var_dump($date1 > $date2); // false
For PHP versions before 5.2.2 (actually for any version), you can use diff.
对于 5.2.2 之前的 PHP 版本（实际上适用于任何版本），您可以使用diff。
$datetime1 = new DateTime('2009-10-11'); // 11 October 2013
$datetime2 = new DateTime('2009-10-13'); // 13 October 2013
$interval = $datetime1->diff($datetime2);
echo $interval->format('%R%a days'); // +2 days
回答by Julien
You can also compare epoch seconds :
您还可以比较纪元秒数：
$d1->format('U') < $d2->format('U')
Source : http://laughingmeme.org/2007/02/27/looking-at-php5s-datetime-and-datetimezone/(quite interesting article about DateTime)
来源：http: //laughingmeme.org/2007/02/27/looking-at-php5s-datetime-and-datetimezone/（很有趣的关于DateTime的文章）
回答by blablabla
If you want to compare dates and not time, you could use this:
如果你想比较日期而不是时间，你可以使用这个：
$d1->format("Y-m-d") == $d2->format("Y-m-d")
回答by jens1o
As of PHP 7.x, you can use the following:
从 PHP 7.x 开始，您可以使用以下内容：
$aDate = new \DateTime('@'.(time()));
$bDate = new \DateTime('@'.(time() - 3600));
$aDate <=> $bDate; // => 1, `$aDate` is newer than `$bDate`
回答by Kyle Coots
$elapsed = '2592000';
// Time in the past
$time_past = '2014-07-16 11:35:33';
$time_past = strtotime($time_past);
// Add a month to that time
$time_past = $time_past + $elapsed;
// Time NOW
$time_now = time();
// Check if its been a month since time past
if($time_past > $time_now){
echo 'Hasnt been a month';
}else{
echo 'Been longer than a month';
}
回答by Tarun Gupta
This may help you.
这可能对你有帮助。
$today = date("m-d-Y H:i:s");
$thisMonth =date("m");
$thisYear = date("y");
$expectedDate = ($thisMonth+1)."-08-$thisYear 23:58:00";
if (strtotime($expectedDate) > strtotime($today)) {
echo "Expected date is greater then current date";
return ;
} else
{
echo "Expected date is lesser then current date";
}
