title: Hide label for input field
body: <p>I am trying to hide the label for a specific field in _form.php without success.</p>
  
  <p>I have tried couple of variation like, but none is working:</p>
  
  <pre><code>&lt;?= $form-&gt;field($model, 'sample_text')-&gt;textArea('label'=&gt;false) ?&gt;
  </code></pre>
  
  <p>and alternate code:</p>
  
  <pre><code>&lt;?= $form-&gt;field($model, 'sample_text')-&gt;textArea('label'=&gt;'') ?&gt;
  </code></pre>
  
  <p>What is the right approach to hide a label? </p>