Yii controller action parameter binding processing_PHP tutorial

Yii controller action parameter binding processing

Starting from version 1.1.4, Yii provides support for automatic action parameter binding. That is, controller actions can define named parameters whose values ​​will be automatically populated by Yii from $_GET.

To illustrate this functionality in detail, assume we need to write a create action for PostController. This action requires passing two parameters via $_GET:

category: an integer representing the ID of the category in which the post is to be published.

language: A string representing the language code used by the post.

When extracting parameters from $_GET, we can no longer write the relevant verification code like the following:

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';
		// ......
	}
}

Now using the action parameter function, we can more easily complete tasks related to the above code:

class PostController extends CController{
	public function actionCreate($category, $language='en'){
		$category = (int)$category;
		echo 'Category:'.$category.'/Language:'.$language;
		// ......
	}
}

Note that we added two parameters to the action method actionCreate. The names of these parameters must match the names we want to extract from $_GET. When the user does not specify the $language parameter in the request, this parameter will use the default value en . Since $category has no default value, if the user does not provide the category parameter in $_GET, a CHttpException (error code 400) will be automatically thrown.

Starting from version 1.1.5, Yii already supports array action parameters. How to use:

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

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