title: How to echo something without rendering something in YII2
body: <p>I want to echo something in an actionpage.</p>
  
  <p>lets say i want to echo <code>hello word</code> within yii layout.</p>
  
  <p>what i know is to write hello word to a file (hello.php in views) and use <code>$this-&gt;render('hello');</code></p>
  
  <p>so how to make it shorter, like <code>$this-&gt;echo('hello word');</code>, so YII will display <code>hello word</code> inside layout?</p>