Question

Possible Duplicate:
Reversing an MD5 Hash

I have a bit of code which I use to create a Guid from a String.

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

Here is the code that I use to convert the String to Guid:

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

echo $guidText;

How can I reverse this code?

Answer 1

md5() is a a hash function. Hash functions are not reversable