laravel刀片文件中的检查变量为null

Question

我有变量$material_details->pricing=null我想检查变量是否在laravel刀片文件中设置。我试过

@isset($material_details->pricing)
 <tr>
   <td>price is not null</td>
 </tr>
@endisset

但没有运气。如何在laravel 5.3刀片文件中检查变量是否设置。

Answer 1

你可以简单地做{{ $material_details ?? 'second value' }}。阅读Elvis和Null合并运算符。

链接：

埃尔维斯：https://en.wikipedia.org/wiki/Elvis_operator

空合并运算符：https://en.wikipedia.org/wiki/Null_coalescing_operator

Answer 2

请尝试以下代码。

@if(is_null($material_details))
    // whatever you need to do here
@else 

Answer 3

如果变量保持，某些值，您的代码将只打印数据。

尝试以下内容：

@if(isset($material_details->pricing))
 <tr>
   <td>price is not null</td>
 </tr>

@else
 <tr>
   <td>null</td>
 </tr>

@endif

Answer 4

你可以使用laravel三元运算符，如下所示

{!! !empty($material_details->pricing) ? '<tr><td>price is not null</td></tr>' : '<tr><td>Empty</td</tr>' !!}

Answer 5

请试试这个

@if($material_details->pricing != null)
   <tr>
     <td>price is not null</td>
   </tr>
@endif

Answer 6

If are able to access your variable through {{ $material_details['pricing'] }} inside your blade file, 

然后这将检查和附加值：

{{ ($material_details['pricing'] == "null") ? "null value" : $material_details['pricing'] }}

要检查和追加元素：

@if($material_details['pricing'] != "null")
  <tr>
   <td>price is not null</td>
 </tr>
 @endif