Php 将时间添加到datetime并签入if语句

我被卡住了。我有一个数据库，在

comments

表中有column

datetime

。基本上，当用户添加一条新注释时，它会插入到此表中，并存储日期时间。所以我现在要做的是检查，假设他上次发表评论已经过去了1分钟。但我在if声明中一直在说实话。 好。在发布之前，这是最后一次检查。输出不符合预期。 我的密码

$limits=新限制（）；
$user=新用户（）；
$time=新的日期时间（）；
$time->add（新的日期间隔（'PT'.1.M'）；
$stamp=$time->format（'Y-m-dh:i:s'）；
$limit=$limits->check_comment_limit（$user->loggedInUser（））；
如果（$limit->time<$stamp）{
回声“刹车”；
}
//用于调试
回音$邮票
'//2014-03-18 13:38:41
echo$限制->时间//2014-03-18 01:37:37

---

很明显，

$limit->time

比

$stamp

小。使用

time（）

很简单，

time（）+60

但是如何使用datetime来实现这一点呢？

我想这就是您想要做的：

<?php
 date_default_timezone_set('UTC'); 

 // Get current datetime.
 $now = new DateTime("now");

 // Get last comment datetime.
 $comment = new DateTime('2014-03-18 13:26:00');

 // Get interval limit between comments.
 $limit = new DateInterval('PT1M');

 // Calculate the difference between the current and last commented datetime.
 $diff = $now->diff($comment);

 // Calculate the total minutes.
 $minutes = $diff->days * 24 * 60;
 $minutes += $diff->h * 60;
 $minutes += $diff->i;

 // Debug output
 echo $now->format('Y-m-d H:i:s').'<br>';
 echo $comment->format('Y-m-d H:i:s').'<br>';
 echo $limit->i.'<br>';
 echo $minutes.' minutes <br>';

 // Limit smaller than difference? Next comment is allowed.
 if($limit->i <= $minutes) {
    echo "Your comment has been saved!";
 } else {
echo "Your aren't allowed to comment now. Wait ".intval($limit->i*60 - 
      $diff->format('%s'))." seconds until you are allowed to comment again.";
 }
 ?>

---

$stamp是一个字符串。是否要比较DateTime值或DateInterval值？为第一个解决方案和第二个解决方案添加了修复程序。
<?php
 date_default_timezone_set('UTC'); 

 // Get current datetime.
 $now = new DateTime("now");

 // Get last comment datetime.
 $comment = new DateTime('2014-03-18 13:26:00');

 // Get interval limit between comments.
 $limit = new DateInterval('PT1M');

 // Calculate the difference between the current and last commented datetime.
 $diff = $now->diff($comment);

 // Calculate the total minutes.
 $minutes = $diff->days * 24 * 60;
 $minutes += $diff->h * 60;
 $minutes += $diff->i;

 // Debug output
 echo $now->format('Y-m-d H:i:s').'<br>';
 echo $comment->format('Y-m-d H:i:s').'<br>';
 echo $limit->i.'<br>';
 echo $minutes.' minutes <br>';

 // Limit smaller than difference? Next comment is allowed.
 if($limit->i <= $minutes) {
    echo "Your comment has been saved!";
 } else {
echo "Your aren't allowed to comment now. Wait ".intval($limit->i*60 - 
      $diff->format('%s'))." seconds until you are allowed to comment again.";
 }
 ?>

<?php
date_default_timezone_set('UTC'); 

// Get current datetime.
$now = new DateTime("now");

// Get last comment datetime.
$comment = new DateTime('2014-03-18 16:45:00');

// Get and add interval limit to comments.
$limit = new DateInterval('PT1M');
$comment->add($limit);

// Debug output
echo $now->format('Y-m-d H:i:s').'<br>';
echo $comment->format('Y-m-d H:i:s').'<br>';

// Limit smaller than difference? Next comment is allowed.
if($comment <= $now) {
    echo "Your comment has been saved!";
} else {
    echo "Your aren't allowed to comment now. On ".$comment->format('Y-m-d H:i:s')." you 
            are allowed to comment again.";
}
?>