title: difference between mongodb.so and mongo.so
body: <p>I noticed that the Mongodb driver installation doc shows different extension name for Mongodb driver:</p>
  
  <p><code>extension=mongo.so</code>; another one shows <code>extension=mongodb.so</code> -- what's the difference?</p>
  
  <p><a href="http://php.net/manual/en/mongodb.installation.manual.php" rel="nofollow noreferrer">http://php.net/manual/en/mongodb.installation.manual.php</a></p>