title: Class MongoDB not found
body: <p>I have followed this document to install mongodb driver.
  <a href="http://php.net/manual/en/mongodb.installation.php.php" rel="nofollow">http://php.net/manual/en/mongodb.installation.php.php</a>.<br/>
  However, when I init a new manager. The class is not found. <br/></p>
  
  <blockquote>
    <p>PHP Fatal error:  Class 'MongoDB\Driver\Manager' not found</p>
  </blockquote>
  
  <p>Any suggestion?</p>