Automatically refresh token using google drive api with php script

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You don’t have to periodically ask for an access token. If you have a refresh_token, PHP client will automatically acquire a new access token for you.

In order to retrieve an refresh_token, you need to set access_type to “offline” and ask for offline access permissions:

$drive->setAccessType('offline');

Once you get a code, 

$_GET['code']= 'X/XXX';
$drive->authenticate();

// persist refresh token encrypted
$refreshToken = $drive->getAccessToken()["refreshToken"];

For future requests, make sure that refreshed token is always set:

$tokens = $drive->getAccessToken();
$tokens["refreshToken"] = $refreshToken;
$drive->setAccessToken(tokens);

If you want a force access token refresh, you can do it by calling refreshToken:

$drive->refreshToken($refreshToken);

Beware, refresh_token will be returned only on the first $drive->authenticate(), you need to permanently store it. In order to get a new refresh_token, you need to revoke your existing token and start auth process again.

Offline access is explained in detail on Google’s OAuth 2.0 documentation.

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