How to use setExtendedAccessToken() - php

Question

i am using Graph api to create a facebook app with PHP .
require_once("facebook.php");
$config = array();
$config[‘appId’] = 'xxxxxxxxxxx';
$config[‘secret’] = 'xxxxxxxxxxxxxxxxxxxxx'; // NEVER USED THIS , JUST INCLUDED IT !
$config[‘fileUpload’] = true; // optional
$facebook = new Facebook($config);
$app_id = "xxxxxxxxx";
$app_secret = "xxxxxxxxxxxxxxxxxxxxxxxxxxxxx";
$my_url = "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx";
$token_url = "https://graph.facebook.com/oauth/access_token?"
. "client_id=" . $app_id . "&redirect_uri=" . urlencode($my_url)
. "&client_secret=" . $app_secret . "&code=" . $code;
$response = file_get_contents($token_url);
$params = null;
parse_str($response, $params);
$graph_url = "https://graph.facebook.com/me?access_token="
. $params['access_token']; // The acess call :)
$at = $params['access_token']; // I USE THIS ACCESS TOKEN
I now use that access token ($at) to make requests . But i need to store the access_token for much longer time (60 days) .
So
1)how do i use setExtendedAccessToken() method &
2) where i should put that in my code &
3) where can i obtain the output from
I am including the PHP SDK too , even though i am not using it .

Answer 1

You can exachange temporary Token for Extended Token. check below code.
try {
$graph_url = "https://graph.facebook.com/oauth/access_token?";
$graph_url .= "client_id=".$FB_APP_ID;
$graph_url .= "&client_secret=".$FB_APP_SECRET;
$graph_url .= "&grant_type=fb_exchange_token";
$graph_url .= "&fb_exchange_token=".$fb_temp_access_token;
$response = #file_get_contents($graph_url);
$params = null;
parse_str($response, $params);
$new_token =$params['access_token'];
} catch (Exception $e) {
//DO NOTHING
}

Answer 2

You can extend an access_token, read about it here: https://developers.facebook.com/docs/howtos/login/extending-tokens/
Put it at the end, after you have already have an acces_token from the login.
You get the output in the same manner you would with other API calls.

Answer 3

The code I am using to get access token is:
$access_token=$facebook->getAccessToken();
I just put this code like this.
if($userid){
try{
$access_token = $facebook->getAccessToken();
echo $access_token;
}
catch(FacebookApiException $e){
//catch error here
}
else{
$loginUrl=$facebook->getLoginUrl(array('redirect_uri'=>'your_url','scope'=>'publish_stream,read_stream,manage_pages');
exit("<script>window.top.location.replace('$loginUrl');</script>");
}
It does store access token that will expire about 2 month ( I use this tool to check).