Method size

/**
 * Get the size of the remote file.
 *
 * @param   string  $remote  FTP path to file whose size to get
 *
 * @return  mixed  number of bytes or false on error
 *
 * @since   3.6.0
 */
public function size($remote)
{
    if (FTP_NATIVE) {
        $size = ftp_size($this->_conn, $remote);
        // In case ftp_size fails, try the SIZE command directly.
        if ($size === -1) {
            $response = ftp_raw($this->_conn, 'SIZE ' . $remote);
            $responseCode = substr($response[0], 0, 3);
            $responseMessage = substr($response[0], 4);
            if ($responseCode != '213') {
                throw new \RuntimeException(Text::sprintf('JLIB_CLIENT_ERROR_FTP_BAD_RESPONSE', __METHOD__), 35);
            }
            $size = (int) $responseMessage;
        }
        return $size;
    }
    // Start passive mode
    if (!$this->_passive()) {
        throw new \RuntimeException(Text::sprintf('JLIB_CLIENT_ERROR_FTP_PASSIVE', __METHOD__), 36);
    }
    // Send size command to the FTP server
    if (!$this->_putCmd('SIZE ' . $remote, array(213))) {
        @fclose($this->_dataconn);
        throw new \RuntimeException(Text::sprintf('JLIB_CLIENT_ERROR_FTP_NOT_EXPECTED_RESPONSE_PATH_SENT', __METHOD__, $this->_response, 213, $remote), 35);
    }
    return (int) substr($this->_responseMsg, 4);
}