title: PHP explode string by html tag
body: <p>Suppose string $a holds</p>
  
  <pre><code>&lt;p&gt;Phasellus blandit enim eget odio euismod eu dictum quam scelerisque.
  &lt;/p&gt;&lt;p&gt;Sed ut diam nisi.&lt;/p&gt;&lt;p&gt;Ut vestibulum volutpat luctus.&lt;/p&gt;
  </code></pre>
  
  <p>How can I explode this into this array</p>
  
  <pre><code>Array(
      [0] = '&lt;p&gt;Phasellus blandit enim eget odio euismod eu dictum quam scelerisque.&lt;/p&gt;';
      [1] = '&lt;p&gt;Sed ut diam nisi. Ut vestibulum volutpat luctus.&lt;/p&gt;';
      [2] = '&lt;p&gt;Ut vestibulum volutpat luctus.&lt;/p&gt;';
  )
  </code></pre>