$this->connID = ftp_connect($this->host, 21, static::FTP_TIMEOUT);
    if (!$this->connID) {
        throw new Exception('Connection to FTP: '. $this->host .' failed.');
    }

    $loginResult = ftp_login($this->connID, $this->username, $this->password);
    if(!$loginResult) {
        throw new Exception('Auth for FTP user ' .$this->username. ' failed.');
    }

$resultPwd = ftp_pwd($this->connID);
    if ($resultPwd===false) {
        throw new Exception ('Command ftp_pwd failed.');
    }

    $resultChdir = ftp_chdir($this->connID, $this->filesDir);
    if ($resultChdir===false) {
        throw new Exception ('ftp_chdir failed, its most likely that directory: ' .$this->filesDir . ' does not exists');
    }

    $resultChdirBack = ftp_chdir($this->connID, $resultPwd);
    if ($resultChdirBack===false) {
        throw new Exception ('Directory test failed, coult not set back directory to: '. $resultChdirBack);
    }

$arrFilePath= ftp_nlist($this->connID, $this->filesDir);

$resultGet = ftp_fget($this->connID, $fhTemp, $remoteFilePath, FTP_ASCII);

Warning: ftp_fget(): Server cannot accept argument.