How get access token from other users - php

Question

I need to read the posts on facebook. I had create the application and the program works if I log with my credential. But when I log with another credential ( like another profile that I have just created) the program doesn't work anymore. This is my login page:
$config = array(
'appId' => APPID,
'secret' => APPSECRET,
'allowSignedRequest' => false // optional but should be set to false for non-canvas apps
);
$facebook = new Facebook($config);
$user_id = $facebook->getUser();
if(!empty($_SESSION)) {
if($user_id) {
try {
$user_profile = $facebook->api('/me','GET');
$login_url = $facebook->getLoginUrl(array('scope' => 'user_posts'));
$access_token=$facebook->getAccessToken();
$facebook->setAccessToken($access_token);
} catch(FacebookApiException $e) {
error_log($e->getType());
error_log($e->getMessage());
}
}
} else {
$login_url = $facebook->getLoginUrl(array('scope' => 'user_posts'));
header("Location: ".$login_url);
}
when I login I obtain the access token and I call graph api:
https://graph.facebook.com/******/posts?access_token=**
This is operation work if I m who is logged in the application. If another login in the app this is not work.
Maybe it's a authentication problem. Maybe I forget some operation that I must do to authentica with another account. Anyone can help me?

Answer 1

You need to submit your App to Facebook then Facebook will check and pass you app then you can access you app other account. If you want to check App Functionality you can use Facebook App test user Id. Below I have Explained how to get test user
Goto App Page.
Click on Roles.
Click on to Right Corner Test users.
It will show your test user details.
Use this details and access you App.

Answer 2

You have to make your app public for all users from here: https://developers.facebook.com
have a look on it:

Answer 3

Use /me/feed instead of /me in your API call
see example below
Permissions
Your app needs user_posts permission from the person who created the post or the person tagged in the post. Then your app can read:
Timeline posts from the person who gave you the permission.
The posts that other people made on that person Timeline.
The posts that other people have tagged that person in.
If you attempt to read data from a feed that your app has not been authorized to access, the call will return an empty array.
please read this thread https://stackoverflow.com/questions/30719556/read-post-from-facebook-home/30732874#30732874
READING
/* PHP SDK v4.0.0 */
/* make the API call */
$request = new FacebookRequest(
$session,
'GET',
'/me/feed'
);
$response = $request->execute();
$graphObject = $response->getGraphObject();
/* handle the result */