FtpClient\FtpClient::isDir PHP Method

    public function isDir($directory)
    {
        $pwd = $this->ftp->pwd();
        if ($pwd === false) {
            throw new FtpException('Unable to resolve the current directory');
        }
        if (@$this->ftp->chdir($directory)) {
            $this->ftp->chdir($pwd);
            return true;
        }
        $this->ftp->chdir($pwd);
        return false;
    }