====== Links erstellen ======

Liste der vordefinierten Aliase: 
https://www.yiiframework.com/wiki/667/yii-2-list-of-path-aliases-available-with-default-basic-and-advanced-app 

<code php>
Yii::getAlias('@web') . '/uploads/' . $filename;
</code>

<code php>
use yii\helpers\Url;

// Url::to() calls UrlManager::createUrl() to create a URL
$url = Url::to(['post/view', 'id' => 100]);
</code>

<code php>
\Yii::$app->urlManager->createUrl('listen/download');
\Yii::$app->urlManager->createAbsoluteUrl('listen/download');
</code>

Mit Parameter:
<code php>
\Yii::$app->urlManager->createUrl(['listen/download', 'id' => 'abc']);
</code>