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Yii v2 snippet guide III

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Yii v2 snippet guide III

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# Switching languages and Language in URL I already [wrote](https://www.yiiframework.com/wiki/2552/yii-v2-snippet-guide#i18n-translations) how translations work. Here I will show how language can be switched and saved into the URL.
 
So  let's add the language switcher into the main menu:
 
```php
 
echo Nav::widget([
 
 'options' => ['class' => 'navbar-nav navbar-right'],
 
 'items' => [
 
  ['label' => 'Language', 'encode'=>false, 'items' => [
 
    ['label' => 'German' , 'url' => \yii\helpers\Url::current(['sys_lang' => 'de']) ],
 
    ['label' => 'English', 'url' => \yii\helpers\Url::current(['sys_lang' => 'en']) ],
 
   ],
 
  ]
 
```
 
Now we need to process the new GET parameter and save it to Session in order to keep the new language. Best is to create a BaseController which will be extended by all controllers. Its content looks like this:
 
```php
 
<?php
 
namespace app\controllers;
 
use yii\web\Controller;
 
class _BaseController extends Controller {
 
  public function beforeAction($action) {
 
    if (isset($_GET['sys_lang'])) {
 
      switch ($_GET['sys_lang']) {
 
        case 'de':
 
          $_SESSION['sys_lang'] = 'de-DE';
 
          break;
 
        case 'en':
 
          $_SESSION['sys_lang'] = 'en-US';
 
          break;
 
      }
 
    }
 
    if (!isset($_SESSION['sys_lang'])) {
 
      $_SESSION['sys_lang'] = \Yii::$app->sourceLanguage;
 
    }
 
    \Yii::$app->language = $_SESSION['sys_lang'];
 
    return true;
 
  }
 
}
 
```
 
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Version: 2.0
Category: Tutorials
Tags: beginer, tutorial, yii2
Written by: rackycz
Last updated by: rackycz
Created on: Jan 21, 2021
Last updated: a year ago
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