title: Your experience Moving PHP 4 to PHP 5
body: <p>We have to move around 50+ Applications (small / large) to PHP 5.3 (from PHP 4.1). Does some has any experience with such an task?</p>
  
  <ul>
  <li>Time needed</li>
  <li>Tools</li>
  <li>Best setup for environment (Servers/Test?)</li>
  </ul>
  
  <p>Does it make sense to move first to PHP 5.2? Is there any way to automatic detect applications using "PHP 4 Features" wich wont work in PHP 5?</p>
  
  <p>I have no idea how to handle such an project. Thanks!</p>