phpseclib\Net\SFTP::_logError PHP Method

    function _logError($response, $status = -1)
    {
        if ($status == -1) {
            if (strlen($response) < 4) {
                return;
            }
            extract(unpack('Nstatus', Strings::shift($response, 4)));
        }
        $error = $this->status_codes[$status];
        if ($this->version > 2 || strlen($response) < 4) {
            extract(unpack('Nlength', Strings::shift($response, 4)));
            $this->sftp_errors[] = $error . ': ' . Strings::shift($response, $length);
        } else {
            $this->sftp_errors[] = $error;
        }
    }