title: Equivalent of "Yii::app()->runController('controller/action')" in Yii2?
body: <p>What is the equivalent function of:</p>
  
  <pre><code>Yii::app()-&gt;runController('controller/action')
  </code></pre>
  
  <p>in Yii2? I would like to call a action from another controller in current controller.</p>
  
  <p>Thanks.</p>