The URL pattern to support the multilanguage view

There are different ways to display the same view in different languages. A basic approach to support multilanguage views could be to insert a language code at the start of the route. For example, the previous route news/index will become en/news/index in English language, it/news/index in Italian language, fr/news/index in French language, and so on.

Append this rule in the rules property of UrlManager:

[
    'pattern' => '<lang:\w+>/<controller>/<action>',
    'route' => '<controller>/<action>',
],

All the requests that have a language ID as the prefix in the path info, will be matched and passed to the <controller>/<action> route with the $lang parameters passed in GET.

Now, create a new action named actionInternationalIndex in NewsController to test the multilanguage support:

public function actionInternationalIndex()
{
    // if missing, value will be 'en'
    $lang = Yii::$app->request-...