Php Laravel 5.1刀片（或仅普通回波）显示的类别不正确

我的Laravel（5.1）视图中有以下代码。PHP块中的代码决定应将哪个类应用于下面的第一个td元素

@foreach($datesUnavailable as $dateUnavailable)
    <?php
        $unavailableDate = strtotime($dateUnavailable->unavailable_on);
        $creationDate = strtotime($dateUnavailable->created_at);
        $newformat = date('D, M d, Y',$unavailableDate);

        $createdBefore = ($unavailableDate - $creationDate)/86400;

        if($createdBefore >= 5) {
            $class = "alert alert-success";                                           
        } else if ($createdBefore < 5 && $createdBefore >= 3) {
            $class = "alert alert-warning"; 
        } else {
            $class = "alert alert-danger";
        }
    ?>
    <tr>
        <td class={{ $class }}>{{ $newformat }}</td>
        <td>{{ $dateUnavailable->unavailability_type }}</td>
        <td>
            {!! Form::open([
                'method' => 'DELETE',
                'route' => ['delete-unavailability', $alias, $dateUnavailable->uc_key],
                'onsubmit' => 'return submitResult();'
            ]) !!}
                {!! Form::submit('Delete', ['class' => 'btn btn-danger btn-xs']) !!}
            {!! Form::close() !!}
        </td>
    </tr>
@endforeach

@foreach（$datesUnavailable as$dateUnavailable）
{{$newformat}}
{{$dateUnavailable->unavailability\u type}
{！！Form:：open([
'方法'=>'删除'，
'route'=>['delete-unavailability'，$alias，$dateUnavailable->uc_key]，
“onsubmit”=>“返回submitResult（）；”
]) !!}
{！！Form:：submit（'Delete'，['class'=>'btn-btn-danger-btn-xs']）
{！！Form:：close（）！！}
@endforeach

但是，当页面呈现时，td元素上的类显示为

<td class="alert" alert-success="">Wed, Feb 28, 2018</td>

2018年2月28日星期三

也就是说，我希望它显示class=“alert alert success”（基于逻辑），但它显示这个奇怪的字符串。如果我执行var_dump（$class），我会看到$class变量的值为“alert alert success”

---

知道为什么会这样吗

这应该适合您：

<td class="{{ $class }}">

添加缺少的

“

标记

@foreach($datesUnavailable as $dateUnavailable)
    <?php
        $unavailableDate = strtotime($dateUnavailable->unavailable_on);
        $creationDate = strtotime($dateUnavailable->created_at);
        $newformat = date('D, M d, Y',$unavailableDate);

        $createdBefore = ($unavailableDate - $creationDate)/86400;

        if($createdBefore >= 5) {
            $class = "alert alert-success";                                           
        } else if ($createdBefore < 5 && $createdBefore >= 3) {
            $class = "alert alert-warning"; 
        } else {
            $class = "alert alert-danger";
        }
    ?>
    <tr>
        <td class="{{ $class }}">{{ $newformat }}</td> <!-- Changed this line -->
        <td>{{ $dateUnavailable->unavailability_type }}</td>
        <td>
            {!! Form::open([
                'method' => 'DELETE',
                'route' => ['delete-unavailability', $alias, $dateUnavailable->uc_key],
                'onsubmit' => 'return submitResult();'
            ]) !!}
                {!! Form::submit('Delete', ['class' => 'btn btn-danger btn-xs']) !!}
            {!! Form::close() !!}
        </td>
    </tr>
@endforeach

@foreach（$datesUnavailable as$dateUnavailable）
{{$newformat}}
{{$dateUnavailable->unavailability\u type}
{！！Form:：open([
'方法'=>'删除'，
'route'=>['delete-unavailability'，$alias，$dateUnavailable->uc_key]，
“onsubmit”=>“返回submitResult（）；”
]) !!}
{！！Form:：submit（'Delete'，['class'=>'btn-btn-danger-btn-xs']）
{！！Form:：close（）！！}
@endforeach

缺少一些

“

在那里！