title: How to use find method in simple html dom when have multiple classes
body: <p>If I have an element something like this </p>
  
  <pre><code>&lt;h1 class="first second last"&gt;
      &lt;p&gt;Paragraph&lt;/p&gt;
  &lt;/h1&gt;
  </code></pre>
  
  <p>I want to use find method only for these three classes. I tried like this :</p>
  
  <pre><code>$html-&gt;find('first.second.last',0)-&gt;plaintext;
  </code></pre>
  
  <p>But it's not working. Is there any idea to use find method for this type of condition?</p>