post from php to my fan page facebook with facebook sdk 5 api 2.4 - facebook-php-sdk

Question

I read dozens of articles, the guidelines, I read everything but I do not understand anything. I'm going crazy. Are three days that I'm trying to post on my facebook fan page through the last 4 API 2.4 SDK.
1. I created the app on facebook but the permissions are almost impossible to enforce
2. I have created the appropriate PHP code with the various authentication codes
the result is always the same: NOTHING
Then the questions:
1. What do you need the app to publish on my fan page?
2. What permissions are needed?
3. If I do not have screenshots to be indicated in the permit to push them through whatever I do (I do the screen shot of the source code?).
4. as you get the access token to the fan page?
A desperate help.
$APP_ID = 'XXXXXXXXXXXXXXXXX'; //app id
$APP_SECRET = 'XXXXXXXXXXXXXXXXXXXXXXXXXXXXXX'; //app secret
$TOKEN = "XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX"; //access token
$page_id = "XXXXXXXXXXXXXXXXXXXXX"; // facebook page id ottenuto da
$message = "Stiamo testando la pubblicazione delle inserzioni anche su Facebook";
$link = "http://qualcosa";
$name = "Me";
/*$fb = new Facebook\Facebook([
'app_id' => $APP_ID,
'app_secret' => $APP_SECRET,
'default_graph_version' => 'v2.4',
]);
$linkData = [
'link' => 'http://qualcosa/altro',
'message' => $message,
];
var_dump($linkData);
$helper = $fb->getPageTabHelper();
$accessToken = $helper->getAccessToken();
var_dump($accessToken);
try {
// Returns a `Facebook\FacebookResponse` object
$response = $fb->post('/me/feed', $linkData,$TOKEN);//
} catch(Facebook\Exceptions\FacebookResponseException $e) {
$msg = 'Graph returned an error: ' . $e->getMessage();
} catch(Facebook\Exceptions\FacebookSDKException $e) {
$msg = 'Facebook SDK returned an error: ' . $e->getMessage();
}
var_dump("MSG: ".$msg);
$graphNode = $response->getGraphNode();
var_dump("Graph: ".$graphNode);
$msg = 'Posted with id: ' . $graphNode['id'];
var_dump($msg);
$msg="Nulla";
// I tryed but nothing
try {
FacebookSession::setDefaultApplication($APP_ID, $APP_SECRET);
$session = new FacebookSession($TOKEN);
var_dump($session);
$page_post = (new FacebookRequest( $session, 'POST', '/'. $page_id .'/feed', array(
'access_token' => $TOKEN,
'name' => $name,
'link' => $link,
'picture' => '',
'caption' => 'Test da Cip!',
'message' => $message,
) ))->execute()->getGraphObject()->asArray();
} catch (Facebook\Exceptions\FacebookResponseException $e)
{$msg = 'Graph returned an error: ' . $e->getMessage();}
catch (Facebook\Exceptions\FacebookSDKException $e)
{$msg = 'Facebook SDK returned an error: ' . $e->getMessage();}
// return post_id, optional
var_dump( $page_post );
var_dump($msg);
echo "<br />Finito";

Answer 1

After many attempts I have solved the problem. In graph explorer serves select the App, then the page on publish, assign publishing rights and withdraw the access token created. In the bottom of the page then you can extend the time validity of the token and you will have to use the latter.