title: yii2: How to work with font awesome icons?
body: <p>I have this HTML link tag that I need to generate using yii\helpers\Html</p>
  
  <pre><code>&lt;a href="register" class="btn btn-black" title="Sign Up"&gt;&lt;i class="fa fa-fw fa-user"&gt;&lt;/i&gt; Sign Up&lt;/a&gt;
  </code></pre>
  
  <p>I am able to do it using method a() but I do not know how to include the font awesome class. Here is the code that I already have using a() method</p>
  
  <pre><code>&lt;?= Html::a('Sign Up',['site/signup'], ['class' =&gt; 'btn btn-black', 'title' =&gt; 'Sign Up']) ?&gt;
  </code></pre>
  
  <p>I am using bootstrap for my CSS. Any help would be appreciated.</p>