laravel5.2表单验证,并显示错误信息的实例

public function rule()
{
 return [
  'name' => [
   'required',
   'max: 5',
   'min: 2',
   'regex: /^[\x{4e00}-\x{9fa5}A-Za-z0-9_]+$/u'
  ],
  'password' => [
   'required',
   'min: 6',
   'max: 12',
  ],
 ];
}

$this->validate($request, $this->rule());

$request->flashOnly(['name', 'password']); // 这是只闪存name和password的意思
// $request->flash(); // 闪存表单的所有数据到session中去

@if (count($errors) > 0)
     <div class="alert alert-danger">
      <ul>
       @foreach ($errors->all() as $error)
        <li>{{ $error }}</li>
       @endforeach
      </ul>
     </div>
@endif

return back()->withErrors('更新图片信息失败');