Method connect

/**
 * Method to connect to a FTP server
 *
 * @param   string  $host  Host to connect to [Default: 127.0.0.1]
 * @param   int     $port  Port to connect on [Default: port 21]
 *
 * @return  boolean  True if successful
 *
 * @since   3.0.0
 */
public function connect($host = '127.0.0.1', $port = 21)
{
    $errno = null;
    $err = null;
    // If already connected, return
    if (\is_resource($this->_conn)) {
        return true;
    }
    // If native FTP support is enabled let's use it...
    if (FTP_NATIVE) {
        $this->_conn = @ftp_connect($host, $port, $this->_timeout);
        if ($this->_conn === false) {
            Log::add(Text::sprintf('JLIB_CLIENT_ERROR_FTP_NO_CONNECT', __METHOD__, $host, $port), Log::WARNING, 'jerror');
            return false;
        }
        // Set the timeout for this connection
        ftp_set_option($this->_conn, FTP_TIMEOUT_SEC, $this->_timeout);
        return true;
    }
    // Connect to the FTP server.
    $this->_conn = @fsockopen($host, $port, $errno, $err, $this->_timeout);
    if (!$this->_conn) {
        Log::add(Text::sprintf('JLIB_CLIENT_ERROR_FTP_NO_CONNECT_SOCKET', __METHOD__, $host, $port, $errno, $err), Log::WARNING, 'jerror');
        return false;
    }
    // Set the timeout for this connection
    socket_set_timeout($this->_conn, $this->_timeout, 0);
    // Check for welcome response code
    if (!$this->_verifyResponse(220)) {
        Log::add(Text::sprintf('JLIB_CLIENT_ERROR_FTP_NOT_EXPECTED_RESPONSE', __METHOD__, $this->_response, 220), Log::WARNING, 'jerror');
        return false;
    }
    return true;
}