Facebook PHP SDK - How to get access token? - php

Question

I'm trying to post on user's Facebook wall from my app. The user granted the permissions to the app to post on his wall, and I have userid in db. I need to send the post automatically, without the user logging in again.
My code is:
try{
require_once(dirname(__FILE__) . '\lib\facebook-php\src\facebook.php' );
}
catch(Exception $o){
print_r($o);
}
$config = array(
'appId' => '123456',
'secret' => '454544',
'allowSignedRequest' => false // optional but should be set to false for non-canvas apps
);
$facebook = new Facebook($config);
$user_id = $facebook->getUser();
$user_id = '123456';
if($user_id) {
// We have a user ID, so probably a logged in user.
// If not, we'll get an exception, which we handle below.
try {
$ret_obj = $facebook->api('/me/feed', 'POST',
array(
'access_token' => $facebook->getAccessToken(),
'link' => 'www.example.com',
'message' => 'Posting with the PHP SDK!'
));
echo '<pre>Post ID: ' . $ret_obj['id'] . '</pre>';
// Give the user a logout link
echo '<br />logout';
} catch(FacebookApiException $e) {
// If the user is logged out, you can have a
// user ID even though the access token is invalid.
// In this case, we'll get an exception, so we'll
// just ask the user to login again here.
var_dump($e);
$login_url = $facebook->getLoginUrl( array(
'scope' => 'publish_stream'
));
echo 'Please login.';
error_log($e->getType());
error_log($e->getMessage());
}
} else {
// No user, so print a link for the user to login
// To post to a user's wall, we need publish_stream permission
// We'll use the current URL as the redirect_uri, so we don't
// need to specify it here.
$login_url = $facebook->getLoginUrl( array( 'scope' => 'publish_stream' ) );
echo 'Please login.';
}
This throws An active access token must be used to query information about the current user. error and asks for login. After I click login, the post is sucesfully posted.
How can I get the access token with userid without the user logging in?

Answer 1

This happens when the active access token is not available while calling the API end point /me
There are two solutions to get rig of this
use the userid instead of /me
set the access-token prior sending the api call
For the first you can make the call as
ret_obj = $facebook->api('/'.$user_id.'/feed', 'POST',
array(
'link' => 'www.example.com',
'message' => 'Posting with the PHP SDK!'
));
You dont need to send 'access_token' => $facebook->getAccessToken(),
The Second option is to do as
$access_token = $facebook->getAccessToken();
$facebook->setAccessToken($access_token);
ret_obj = $facebook->api('/me/feed', 'POST',
array(
'link' => 'www.example.com',
'message' => 'Posting with the PHP SDK!'
));
NOTE: publish_stream scope must be send while doing the login
Deprecation Notice :publish_stream was replaced by publish_actions, check the facebook doc for permission

Answer 2

you have to get permission .
Check it out here
https://developers.facebook.com/docs/reference/login/