ErrorException 未定义变量 Laravel
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ErrorException Undefined Variable Laravel
提问by TheGrip Vic
Hey guys I just started learning how to use Laravel and when I tried running the code below I get:
大家好，我刚开始学习如何使用 Laravel，当我尝试运行下面的代码时，我得到：
Undefined variable error
未定义变量错误
<!DOCTYPE html>
<html>
<head>
<title></title>
</head>
<body>
<ul>
@foreach ($tasks as $task)
<li>{{ $task->Todo }}</li>
@endforeach
</ul>
</body>
</html>
this is the code used in the web.phpfile:
这是web.php文件中使用的代码：
web.php
网页.php
Route::get('/tasks', function () {
$tasks = DB::table('tasks')->get();
//return $tasks;
return view('welcome',compact($tasks));
});
I discovered that if I use the $GLOBALS['variable'];to replace the $tasksvariable in both files it works.
我发现如果我使用$GLOBALS['variable'];来替换$tasks两个文件中的变量，它就可以工作。
But in the example video from laracasts they didn't make use of the $GLOBALS['variable'];
但是在来自 laracasts 的示例视频中，他们没有使用 $GLOBALS['variable'];
This is the error I get:
这是我得到的错误：
"Undefined variable: tasks (View: C:\Users\Friday\Documents\Documentations\laraprojects\BrainGear\resources\views\welcome.blade.php)"
“未定义变量：任务（视图：C:\Users\Friday\Documents\Documentations\laraprojects\BrainGear\resources\views\welcome.blade.php）”
回答by Kenny Horna
You need to pass the variable name in the compact()helper (as @utdev said). You can read more about this here. So:
您需要在compact()助手中传递变量名称（如@utdev 所说）。您可以在此处阅读更多相关信息。所以：
return view('welcome', compact('tasks'));
Another option is to send the variable to the view like this:
另一种选择是像这样将变量发送到视图：
return view('welcome')->with('tasks', $tasks);
or even "sugared" (equivalent to the last one):
甚至“加糖”（相当于最后一个）：
return view('welcome')->withTasks($tasks);
To know more about this, check the Passing data to viewssection of the documentation.
要了解更多信息，请查看文档的将数据传递给视图部分。
回答by utdev
You have to return the variable like this:
您必须像这样返回变量：
return view('welcome', compact('tasks'));
Then you can use it like you did but use lowercase for that case please:
然后你可以像你一样使用它，但请在这种情况下使用小写：
@foreach ($tasks as $task)
<li>{{ $task->todo }}</li>
@endforeach
