title: Need a simple hash in PHP
body: <p>I need to create a simple hashing method for passing some data in a URL. It doesn't need to be very secure, it just shouldn't be obvious to most people.</p>
  
  <p>The hash needs to contains the numerical id of the sender and the id of the recipient and I should be able to decode the data after reading the appended hash.</p>
  
  <p>Any ideas? I'd like the hash to be a short as possible, simply because this url is meant to be shared via IM, email, etc..</p>