Reverse code. Guid to String in PHP
<blockquote>
  <p><strong>Possible Duplicate:</strong><br>
  <a href="http://stackoverflow.com/questions/1471654/reversing-an-md5-hash">Reversing an MD5 Hash</a>  </p>
</blockquote>



<p>I have a bit of code which I use to create a Guid from a String.</p>

<p>The code works fine but I now need to reverse the Guid it created and convert it back to the string.</p>

<p>Here is the code that I use to convert the String to Guid:</p>

<pre><code>$s = strtoupper(md5($myString));
$guidText = 
substr($s,0,8) . '-' . 
substr($s,8,4) . '-' . 
substr($s,12,4). '-' . 
substr($s,16,4). '-' . 
substr($s,20); 

echo $guidText;
</code></pre>

<p>How can I reverse this code?</p>
