Implementation of the magic __get() method.
If the connection isn't set to anything, this will call the connect() method and set it to and return the result; afterwards, the connection will be returned directly without using this method.
function __get($name) {
  if ($name == 'connection') {
    $this
      ->connect();
    return $this->connection;
  }
  if ($name == 'chroot') {
    $this
      ->setChroot();
    return $this->chroot;
  }
}