Facebook用户访问令牌PHP

Question

As stated on the Facebook documentation, access tokens are portables, that means that an access token could be obtained on the front-end side of the application and passed to the back-end side to handle Graph API requests.

The problem is: how to properly instantiate and setup the Access Token in the back-end side?

I'm currently doing the following code:

use Facebook\Authentication\AccessToken;
$accessToken = new AccessToken('{access-token goes here}');
print_r($accessToken); // inspecting the token

When print_r is called, some of the token information are missing, such as the expiresAt attribute. This attribute, for instance, is present when the access token is generated by the FacebookRedirectLoginHelper::getAccessToken on the callback process.

Does the lack of this attribute interferes on the flow of things? If so, then how to properly instantiate a portable Access Token in the back-end ?

Answer 1

Have a look at

• https://developers.facebook.com/docs/php/howto/example_facebook_login/5.0.0#fbcallback

Sample code:

var_dump($accessToken->getValue());

// The OAuth 2.0 client handler helps us manage access tokens
$oAuth2Client = $fb->getOAuth2Client();

// Get the access token metadata from /debug_token
$tokenMetadata = $oAuth2Client->debugToken($accessToken);
echo '<h3>Metadata</h3>';
var_dump($tokenMetadata);