title: Is PHP 5.3 backwards-compatible with PHP 5.2?
body: <p>I'm starting to learn PHP. I would like to use PHP 5.3 because it's the newest version so far. I'm working on a project in which I'll use PHP 5.2 scripts that someone gave me.</p>
  
  <p>Are they going to run just fine even though I'm using PHP 5.3? </p>