LdapTools\Connection\LastErrorStrategy::getInstance PHP Method

    public static function getInstance($type, $connection)
    {
        if (LdapConnection::TYPE_AD == $type) {
            return new ADLastErrorStrategy($connection);
        } else {
            return new self($connection);
        }
    }

 /**
  * {@inheritdoc}
  */
 public function getDiagnosticMessage()
 {
     return LastErrorStrategy::getInstance($this->config->getLdapType(), $this->connection)->getDiagnosticMessage();
 }