title: preg_replace syntax to add chrs after the closing of an image tag
body: <p>I need a preg_replace syntax to add something (anything) after the /> of an image tag that is within a string I have.  </p>
  
  <p>So for example</p>
  
  <pre><code>$string="here is a &lt;img src="images/test.gif" /&gt; string!"   
  </code></pre>
  
  <p>needs to become...</p>
  
  <pre><code>$string="here is a &lt;img src="images/test.gif" /&gt;&lt;br&gt; string!"
  </code></pre>