title: Which Facebook SDK to use with PHP 5.3?
body: <p>Unfortunately I've reached a bit of a dead end. Due to various legacy and other reasons, I can't upgrade a system to PHP 5.4. And <a href="https://developers.facebook.com/docs/php/gettingstarted/4.0.0">according to Facebook</a>, I need 5.4 to run the latest SDK.</p>
  
  <p>I'm willing to settle for a lower SDK, but:</p>
  
  <ol>
  <li>Will I be okay if I use an older SDK?</li>
  <li>Which SDK should I use?</li>
  </ol>
  
  <p>Bonus Question:</p>
  
  <ol start="3">
  <li><p>What should the composer path be changed to to use the old SDK? Currently I have:</p>
  
  <p>"facebook/php-sdk-v4" : "4.0.*"</p></li>
  </ol>