Components

Components are the main building blocks of Yii applications. Components are instances of yii\base\Component, or an extended class. The three main features that components provide to other classes are:

Properties
Events
Behaviors

Separately and combined, these features make Yii classes much more customizable and easier to use. For example, the included date picker widget, a user interface component, can be used in a view to generate an interactive date picker:

use yii\jui\DatePicker;

echo DatePicker::widget([
    'language' => 'ru',
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