Laravel ErrorException：未定义的变量

Question

我正在尝试通过 axios api troughr Laravel 上传文件。下面是控制器代码，但是 我不明白为什么 Laravel 告诉我第 24 行的变量名是未定义的。 在我看来，变量已定义...

public function store(Request $request)
{
    $this->validate($request, [
        'image' => 'required'
]);

if($request->get('image'))
{
    $image = $request->get('image');
    $name = time().'.' . explode('/', explode(':', substr($image, 0, strpos($image, ';')))[1])[1];
    \Image::make($request->get('image'))->save(public_path('images/').$name);
}

$image= new FileUpload();
$image->image_name = $name;
$image->save();

return response()->json(['success' => 'You have successfully uploaded an image'], 200);
}

这是第 24 行：$image->image_name = $name;

Answer 1

你必须让你的变量在更高的可见性范围内：

public function store(Request $request)
{
    $this->validate($request, [
        'image' => 'required|image|mimes:jpeg,png,jpg,gif,svg|max:2048'
]);
 $name=''; // here you define your vaiable
if($request->get('image'))
{
    $image = $request->get('image');
    $name = time().'.' . explode('/', explode(':', substr($image, 0, strpos($image, ';')))[1])[1];
    \Image::make($request->get('image'))->save(public_path('images/').$name);
}

$image= new FileUpload();
$image->image_name = $name;
$image->save();

return response()->json(['success' => 'You have successfully uploaded an image'], 200);
}

关于变量范围的更多信息：

https://phppot.com/php/variable-scope-in-php/