Yii 2 interview questions and Answers

Developers can get the controller name in Yii2 throigh this method -

//Controller Name
echo Yii::$app->controller->id;

We can also get current action through this method:
echo Yii::$app->controller->action->id;

findAll(): It gives us a list of active record models that match the specified conditions.

Admin::findAll(['type' => 'client', 'status' => 1]);

find(): It returns a single record using the primary key.

Admin::find(['id' => 1]);

1. delete()

$connection->createCommand()->delete('tbl_user', 'status = 1') ->execute();

2. save()

$model = new Admin;
$model->name = 'YII2';
$model->email = '[email protected]';
$model->save(); // this is equivalent to $model->insert();

3. insert()

$connection->createCommand()->insert('tbl_user',
[
'name' => 'yii',
'status' => 1,
])
->execute();

DateTimePicker is a widget in the Yii2 wrapper for Bootstrap DateTimePicker plugin. This plugin is specially styled for Yii 2.0 and is similar to DatePicker widget except that it adds time functionality. This widget also allows degradation to an HTML text input if your browser is not supporting JQuery.

Yii2 Basic App

• @app: It uses to get the application root directory
• @vendor: It uses to get vendor directory on your root app install directory
• @runtime: It uses to get application files runtime storage folder
• @web: It uses to get application base URL path
• @webroot: It uses to get application web root
• @tests: It uses to get console tests directory

Yii2 Advanced App

• @app: It uses to get application root directory frontend or backend
• @vendor: It uses to get vendor directory on root app install directory
• @runtime: It uses to get application files runtime storage folder
• @web: It uses to get application base URL
• @webroot: It uses to get application web root path
• @tests: It uses to get console tests directory
• @common: It uses to get Alias of common root folder on root app install directory
• @frontend: It uses to get Alias of frontend root folder on root app install directory
• @backend: It uses to get Alias of backend root folder on root app install directory
• @console: It uses to get Alias of console root folder on root app install directory

A flash message in Yii 2 is used to keep a message in session through requests of the same user. By default, a flash message is removed from the session after it has been shown to the user. You can set the Flash messages through setFlash() Method