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Yii控制器动作参数绑定处理
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Yii控制器动作参数绑定处理

Jun 13, 2016 am 09:07 AM
yii controller binding

Yii控制器动作参数绑定处理

从版本 1.1.4 开始,Yii 提供了对自动动作参数绑定的支持。就是说,控制器动作可以定义命名的参数,参数的值将由 Yii 自动从 $_GET 填充。

为了详细说明此功能,假设我们需要为 PostController 写一个 create 动作。此动作需要通过$_GET传递两个参数:

category:一个整数,代表帖子(post)要发表在的那个分类的ID。

language:一个字符串,代表帖子所使用的语言代码。

从 $_GET 中提取参数时,我们可以不再像下面这样写相关的验证代码了:

class PostController extends CController{
	public function actionCreate(){
		if(isset($_GET['category']))
			$category=(int)$_GET['category'];
		else
			throw new CHttpException(404,'invalid request');
		if(isset($_GET['language']))
			$language=$_GET['language'];
		else
			$language='en';
		// ......
	}
}
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现在使用动作参数功能,我们可以更轻松的完成如上面代码的相关任务:

class PostController extends CController{
	public function actionCreate($category, $language='en'){
		$category = (int)$category;
		echo 'Category:'.$category.'/Language:'.$language;
		// ......
	}
}
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注意我们在动作方法 actionCreate 中添加了两个参数。这些参数的名字必须和我们想要从 $_GET 中提取的名字一致。当用户没有在请求中指定 $language 参数时,这个参数会使用默认值 en 。由于 $category 没有默认值,如果用户没有在 $_GET 中提供 category 参数,将会自动抛出一个 CHttpException (错误代码 400) 异常。

从版本1.1.5开始,Yii已经支持数组的动作参数。使用方法如下:

class PostController extends CController{
	public function actionCreate(array $categories){
		// Yii will make sure $categories be an array
	}
}
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