php 未定义变量：$ Laravel 5
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Undefined variable: $ Laravel 5
提问by zlotte
This is the code from CategoriesController:
这是来自 CategoriesController 的代码：
public function index()
{
$categories = Category::all();
return view('/home', compact('categories'));
}
And this is the code that I'm writing to the home.blade.php
这是我写给 home.blade.php
@foreach($categories as $cat)
@endforeach
And then in home.blade.php
然后在 home.blade.php
I'm getting this error: Undefined variable: categories
我收到此错误： Undefined variable: categories
Why this happening ? Everything works fine with Articles but not categories and the code is the same.
为什么会这样？文章一切正常，但类别无效，代码相同。
Home.blade.php
首页.blade.php
@extends('app')
@section('content')
<div class="col-md-4 pull-right">
<div class="panel panel-primary">
<div class="panel-heading">
<h3 class="panel-title">Categories</h3>
</div>
<div class="panel-body">
@foreach($categories as $cat)
<div class="col-lg-6">
<ul class="list-unstyled">
<li><a href="articles/category/{{ }}">News</a>
</li>
</ul>
</div>
@endforeach
</div>
</div>
</div>
@if(count($articles))
@foreach($articles as $article)
<div class="panel panel-default col-md-8">
<div class="panel-heading">
<h3>{{ $article->title }}</h3>
<small>posted by <a href="users/{{ $article->author->name }}">{{ $article->author->name }}</a> {{ $article->created_at }}</small>
</div>
<div class="panel-body">
{!! str_limit($article->body, 1000) !!}
<hr>
<a href="{{ url('/articles/'.$article->slug) }}">Read More</a>
</div>
</div>
@endforeach
@else
<h1>No articles at the moment.</h1>
@endif
<br>
{!! $articles->render() !!}
@stop
回答by Ben Swinburne
You have two routes
你有两条路线
Route::get('/home', 'ArticlesController@index');
Route::get('/home', 'CategoriesController@index');
Which means when you visit /home, only ArticlesController@index is fired, not both.
这意味着当你访问 /home 时，只有 ArticlesController@index 被触发，而不是两者都被触发。
This means that the $categoriesvariable used in the view is not populated because your index()method in CategoriesController is intended to do this but is never called.
这意味着$categories未填充视图中使用的变量，因为index()CategoriesController 中的方法旨在执行此操作但从未调用过。
Therefore you need to do something like this
因此你需要做这样的事情
Route::get('/home', 'HomeController@index');
public function index()
{
$categories = Category::all();
$articles = Article::all();
return view('/home', compact('articles', 'categories'));
}
回答by Adnan Zafar
try to use
尝试使用
return View::make('/home')->with(compact('categories'));
instead of
代替
return view('/home', compact('categories'));
回答by anthony zorilla
I insert this in the top of my @foreach
我将它插入到 @foreach 的顶部
<?php
use App\models\PersonalContact;
$data = PersonalContact::all();
?>
or this before @foreach add @if statement like this
或者在@foreach 之前添加这样的@if 语句
@if (count($data) > 0)
@foreach ($data as $bloginfo)
<tr role="row" class="odd">
<td class="sorting_1">{{$bloginfo->name}}</td>
<td>{{$bloginfo->description}}</td>
<td>{{$bloginfo->email}}</td>
<td>{{$bloginfo->phone}}</td>
<td><img src="{{url('images/'.$bloginfo->image)}}" alt="" width="100px" height="100px"></td>
<td><a href="{{url('admin/{admin}/personalcontact/create')}}" class="btn btn-app"><i class="fas fa-edit"></i>Add</a> | <a href="{{url('admin/{admin}/personalcontact/{personalcontact}/edit')}}" class="btn btn-app"><i class="fas fa-edit"></i>Edit</a> | <a class="btn btn-app"><i class="fas fa-edit"></i>Delete</a></td>
</tr>
@endforeach
@endif
回答by Cheda.M
Hi guys well in my case it was my database table name it was ( table_23) of which I kept on getting the undefined variable error then I changed it to (table23) and my problem was solved
大家好，在我的情况下，这是我的数据库表名（table_23），其中我一直收到未定义的变量错误，然后我将其更改为（table23）并且我的问题解决了
