What are the differences between yii1 and yii2?

Yii is a high-performance PHP5 web application development framework. A simple command line tool yiic can quickly create a web application code framework. Developers can add business logic based on the generated code framework to quickly complete application development.

The Yii2.0 version framework is completely rewritten, and there are quite a few differences between the 1.1 and 2.0 versions. [Recommended learning: Yii Getting Started Tutorial]

So what are the differences between yii1 and yii2?

Yii 2.0 requires PHP 5.4 or higher, which is a huge improvement over the PHP 5.2 required by Yii 1.1.

1. The application instance directly uses global named variables to access: $app without calling app().

2. A significant change in the view layer of Yii2 is the introduction of view classes, which makes the implementation of the MVC pattern more complete. Correspondingly, the relevant presentation layer auxiliary classes are managed by the new view class. For example, theme: Yii::app()->theme->baseUrl should be updated to Yii::$app->view-> theme->baseUrl, or $this->theme->baseUrl.

3. Yii2 introduces the concept of resource packages, and the way of resource reference has changed greatly.

There are two ways to introduce resources, one is through the AppAsset class in the assets directory, and the other is through a registration method similar to Yii1.

Yii::app()->getClientScript() method is no longer available. For example, if you want to dynamically register a JS script file in the page, the changes are as follows:

Yii::app() ->getClientScript()->registerScriptFile('...') is changed to Yii::$app->view->registerJsFile('...'),

or $this- >registerJsFile('...').

4. Use the database

For example, query a record with user_id

yii1:

User::model()->find(' user_id=:user_id',[':user_id'=>$user_id]);

yii2:

User::find()->where('user_id=:user_id' ,[':user_id'=>$user_id])->one();

Query multiple records:

yii1:

User::model( )->findAll('status=:status',[':staus'=>$status]);

yii2:

User::find()->where ('status=:status',[':staus'=>$status])->all();

In addition, yii2 also provides the asArray() method, and the direct query result is an array:

User::find()->where('status=:status',[':staus'=>$status])->asArray()->all();

If you are a beginner, it is recommended to learn yii2 directly.

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