Foreach循环回声组错误

这里有一个foreach循环，遍历客户端可查看的日期日历。在第一个循环中，我将$i作为一个等于0的变量传递。然后，我给出规则，说明如果$i等于0或可被3整除，则返回div类组。但是，如果循环在$i等于1或可被2整除时退出，则关闭类组并继续遍历html。由于某种原因，当我有一两个条目时，组无法正确关闭，下面的div被捕获在里面。请你看看这个代码，看看我在哪里搞砸了。。。

    <div class = "calender_dates">
<div class = 'calender_select'>
    <div class = 'dates past active'></div>
    <div class = "dates future"></div>
</div>
<div class = "past_events grid-calender">
    <?php $i=0 ?>
@foreach($past as $event)
<?php if($i==0 OR is_int($i/3)){
        if($i==0){
            echo '<div class="group_loop_first">';
        } else{
            echo '<div class="group_loop">';
        }
              } ?>
   <div class = "p_date grid-date">
        <div class = 'date_head'>
            <div class = "head_img">
                <p>img</p>
            </div>
            <div class = "head_description">
                <p>{{$event->caption}}</p>
            </div>
        </div>
        <div class = "date_foot">
            <div class = "foot_date">
                <p class = "day">
                    {{$event->publish_at->format('d')}}
                </p>

                <p class = "month">
                    {{$event->publish_at->format('M')}}
                </p>
            </div>
            <div class = "foot_callout">
                <p class = "name">{{$event->name}}</p>
                <p>{{$event->address}}</p>
            </div>
        </div>
    </div>
    <?php $i++ ?>
    <?php if($i==0 OR is_int($i/3)){
            echo '</div>';
        }?>
    @endforeach
     <?php
        if($i==1 OR $i==2 OR is_int($i/2)){
                echo '</div>';
            }?>
</div>
<div class = "future_events grid-calender">
    <?php $i=0 ?>
@foreach($future as $event)
<?php if($i==0 OR is_int($i/3)){
                  echo '<div class="group_loop">';
              } ?>
   <div class = "p_date grid-date">
        <div class = 'date_head'>
            <div class = "head_img">
                <p>img</p>
            </div>
            <div class = "head_description">
                <p>{{$event->caption}}</p>
            </div>
        </div>
        <div class = "date_foot">
            <div class = "foot_date">
                    <p class = "day">
                        {{$event->publish_at->format('d')}}
                    </p>

                    <p class = "month">
                        {{$event->publish_at->format('M')}}
                    </p>
            </div>
            <div class = "foot_callout">
                <p class = "name">{{$event->name}}</p>
                <p>{{$event->address}}</p>
            </div>
        </div>
    </div>
    <?php $i++ ?>
    <?php if($i==0 OR is_int($i/3)){
                echo '</div>';
            }?>
    @endforeach
    <?php
    if($i==1 OR is_int($i/2)){
            echo '</div>';
        }?>
    </div>