$strClientId = "xx";
$strClientSecret = "xx";
if (file_exists(gdg_path . 'token.json')) {
    $token = file_get_contents(gdg_path . 'token.json');
    $token = json_decode($token, true);
    $strRefreshToken = $token; // json'dan çek
}

$obj = new GoogleDriveApi($strClientId, $strClientSecret);

if (!file_exists(gdg_path . 'token.json')) {
    if (empty($_GET['code'])) {
        $strAuthScope = "https://www.googleapis.com/auth/drive";
        $strAuthorizetUrl = $obj->getAuthorizetUrl($strAuthScope);
        header("Location:{$strAuthorizetUrl}");
        exit;
    } else {
        $strRefreshToken = $obj->getRefreshToken($_GET['code']);
        $strRefreshToken = json_encode($strRefreshToken);
        file_put_contents(gdg_path . 'token.json', $strRefreshToken);
        header("Location: /");
    }
}