prblem with post on page of facebook with api - php

Question

I wrote a code for post a message on my page (not own timeline)
post.php
<?php
require_once __DIR__ . '/vendor/autoload.php';
session_start();
$fb = new Facebook\Facebook([
'app_id' => 'xxxxxxxxxxxxxx',
'app_secret' => 'xxxxxxxxxxxxxx',
'default_graph_version' => 'v2.5',
]);
$data = [
'message' => 'My awesome photo upload example.',
];
try {
// Returns a `Facebook\FacebookResponse` object
$response = $fb->post('/xxxxxxxxxxxxxx/feed', $data, $_SESSION['facebook_access_token']);
} catch(Facebook\Exceptions\FacebookResponseException $e) {
echo 'Graph returned an error: ' . $e->getMessage();
exit;
} catch(Facebook\Exceptions\FacebookSDKException $e) {
echo 'Facebook SDK returned an error: ' . $e->getMessage();
exit;
}
$graphNode = $response->getGraphNode();
echo 'Photo ID: ' . $graphNode['id'];
index.php
<?php
require_once __DIR__ . '/vendor/autoload.php';
session_start();
$app_id = 'xxxxxxxxxxxxxx';
$app_secret = 'xxxxxxxxxxxxxx';
$fb = new Facebook\Facebook([
'app_id' => $app_id,
'app_secret' => $app_secret,
'default_graph_version' => 'v2.4',
'default_access_token' => isset($_SESSION['facebook_access_token']) ? $_SESSION['facebook_access_token'] : 'APP-ID|APP-SECRET'
]);
try {
$response = $fb->get('/xxxxxxxxxxxxxx?fields=id,name');
$user = $response->getGraphUser();
echo 'Name: ' . $user['name'];
//exit; //redirect, or do whatever you want
} catch(Facebook\Exceptions\FacebookResponseException $e) {
echo 'Graph returned an error: ' . $e->getMessage();
} catch(Facebook\Exceptions\FacebookSDKException $e) {
echo 'Facebook SDK returned an error: ' . $e->getMessage();
}
$helper = $fb->getRedirectLoginHelper();
$permissions = ['email', 'user_likes', 'manage_pages', 'publish_actions'];
$loginUrl = $helper->getLoginUrl('http://xxxxxxxxxxxxxx/facebook/login-callback.php', $permissions);
echo 'Log in with Facebook!';
login-callback.php
<?php
require_once __DIR__ . '/vendor/autoload.php';
session_start();
$app_id = 'xxxxxxxxxxxxxx';
$app_secret = 'xxxxxxxxxxxxxx';
$fb = new Facebook\Facebook([
'app_id' => $app_id,
'app_secret' => $app_secret,
'default_graph_version' => 'v2.4',
'default_access_token' => 'APP-ID|APP-SECRET'
]);
$helper = $fb->getRedirectLoginHelper();
try {
$accessToken = $helper->getAccessToken();
} catch(Facebook\Exceptions\FacebookResponseException $e) {
// When Graph returns an error
//echo 'Graph returned an error: ' . $e->getMessage();
} catch(Facebook\Exceptions\FacebookSDKException $e) {
// When validation fails or other local issues
//echo 'Facebook SDK returned an error: ' . $e->getMessage();
}
if (isset($accessToken)) {
// Logged in!
$_SESSION['facebook_access_token'] = (string) $accessToken;
} elseif ($helper->getError()) {
// The user denied the request
}
header('Location: index.php');
It's just work when in file post.php use this code:
$response = $fb->post('/me/feed', $data, $_SESSION['facebook_access_token']);
And then post show on my timeline.
But when I want to post on page and use this:
$response = $fb->post('/xxxxxxxxxxxxxx/feed', $data, $_SESSION['facebook_access_token']);
don't work and not appears anythings, and don't show my post on the page or timeline!