为什么会出现错误:未定义变量?

问题描述：

我创建了一个输入脚本.我将名称和脚本发布名称写入数据库.但是我有错误-ErrorException [ Notice ]: Undefined variable: result.

I created an input script. I write name and script post name into database. But I have error - ErrorException [ Notice ]: Undefined variable: result .

有我的控制器:

class Controller_About extends Controller_Template{
    public function action_index()
    {
        if(!empty($_POST['name'])){
            $name = Model::factory('index')->insert_names($_POST['name']);;
            $result= $name;
        }
        $this->template->site_name = Kohana::$config->load('common')->get('site_name');
        $this->template->site_description = Kohana::$config->load('common')->get('site_description');
        $this->template->page_title = 'About';
        $this->template->content = View::factory('about/about')->set('result', $result);
        $this->template->styles[] = 'index/index';
    }
}

我的观点是

<form action="">
    <input type="text" name="name" />
</form>

这是我的模型:

Class Model_Index Extends Model {

    public static function insert_names($name){
        $query = DB::query(DATABASE::INSERT, 'INSERT INTO names (name) VALUES (:name)')->parameters(array(':name' => $name));
    }
}

问题出在哪里?

编辑#1

我编辑了控制器:

class Controller_About extends Controller_Template{
    public function action_index()
    {$result = '';
        if(!empty($_POST['name'])){
            $name = Model::factory('index')->insert_names($_POST['name']);;
            $result= $name;
        }
        $this->template->site_name = Kohana::$config->load('common')->get('site_name');
        $this->template->site_description = Kohana::$config->load('common')->get('site_description');
        $this->template->page_title = 'About';
        $this->template->content = View::factory('about/about')->set('result', $result);
        $this->template->styles[] = 'index/index';
    }
}

但是这不起作用，因为当我输入名称时，它们不会放入数据库中.

But this not working, because when I input name, they not puts into database.

答

可能是因为向name传递了一个空值，并且除非该变量为非空值，否则不会对其进行初始化.但是它在if

Possibly because an empty value was passed to name and the variable doesn't get initialized unless its non-empty. But it gets used in the following line, outside the if

$this->template->content = View::factory('about/about')->set('result', $result);

在if()之外初始化$result:

$result = "";
if(!empty($_POST['name'])){
    $name = Model::factory('index')->insert_names($_POST['name']);;
    $result= $name;
}

或将其内跟随if(){}的整个块移动.

Or move the entire block that follows the if(){} inside it.

public function action_index()
{
    if(!empty($_POST['name'])){
      $name = Model::factory('index')->insert_names($_POST['name']);;
      $result= $name;

      // move this inside the if()
      $this->template->site_name = Kohana::$config->load('common')->get('site_name');
      $this->template->site_description = Kohana::$config->load('common')->get('site_description');
      $this->template->page_title = 'About';
      $this->template->content = View::factory('about/about')->set('result', $result);
      $this->template->styles[] = 'index/index';
   }
}

为什么会出现错误:未定义变量?

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