htmlspecialchars（）期望参数1是字符串，数组给定laravel

Question

我试图根据价格（从高到低和从低到高）在搜索页面中记录（旅游），用提交更改的表单事件。下面是窗体的代码：

{!!Form::open(['route' => 'short','method' => 'GET', 'role' => 'search','class'=>'select-filters'])!!} 
    <input type="hidden" name="country" value="{{$country}}"> 
    <input type="hidden" name="category" value="{{$category}}"> 
    <input type="hidden" name="days" value="{{$days}}"> 
    <select name="sort_price" id="sort-price" onchange="this.form.submit()"> 
    <option value="" selected="">Sort by price</option> 
    <option value="lower">Lowest price</option> 
    <option value="higher">Highest price</option> 
    </select> 
{!! Form::close() !!} 

，我已经初始化值在同一个页面，但给错误htmlspecialchars() expects parameter 1 to be string, array given：

@if(Request::only('country') != null) 
    {{$country = Request::only('country')}} 
@else 
    {{ $country = null }} 
@endif 
@if(Request::only('category') != null) 
    {{$category = Request::only('category')}} 
@else 
    {{ $category = null }} 
@endif 
@if(Request::only('days') != null) 
    {{$days = Request::only('days')}} 
@else 
    {{ $days = null }} 
@endif 

在Request::only()值被从搜索表单传递在索引页面。当我死和转储：

{{dd(Request::only('country','category','days'))}} 

我抛出以阵列形式传入的值

它转储专用密钥值对，如果我只传递一个参数：

{{dd(Request::only('country'))}} 

或

 {{dd(Request::only('category'))}} 

或

 {{dd(Request::only('days'))}} 

Answer 1

only()总是返回一个数组，所以要得到一个字符串做到这一点：

{{ request('country') }} 

取而代之的是：没有双引号

{{ Request::only('country') }}