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like-public-posts.php
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like-public-posts.php
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<?php
session_start();
require_once __DIR__ . '/src/Facebook/autoload.php'; // download official fb sdk for php @ https://github.com/facebook/php-graph-sdk
$fb = new Facebook\Facebook([
'app_id' => 'APP_ID',
'app_secret' => 'APP_SECRET',
'default_graph_version' => 'v2.12'
]);
$helper = $fb->getRedirectLoginHelper();
// app directory could be anything but website URL must match the URL given in the developers.facebook.com/apps
define('APP_URL', 'http://sohaibilyas.com/APP_DIR/');
$permissions = ['publish_actions']; // optional
try {
if (isset($_SESSION['facebook_access_token'])) {
$accessToken = $_SESSION['facebook_access_token'];
} else {
$accessToken = $helper->getAccessToken();
}
} catch(Facebook\Exceptions\FacebookResponseException $e) {
// When Graph returns an error
echo 'Graph returned an error: ' . $e->getMessage();
exit;
} catch(Facebook\Exceptions\FacebookSDKException $e) {
// When validation fails or other local issues
echo 'Facebook SDK returned an error: ' . $e->getMessage();
exit;
}
if (isset($accessToken)) {
if (isset($_SESSION['facebook_access_token'])) {
$fb->setDefaultAccessToken($_SESSION['facebook_access_token']);
} else {
// getting short-lived access token
$_SESSION['facebook_access_token'] = (string) $accessToken;
// OAuth 2.0 client handler
$oAuth2Client = $fb->getOAuth2Client();
// Exchanges a short-lived access token for a long-lived one
$longLivedAccessToken = $oAuth2Client->getLongLivedAccessToken($_SESSION['facebook_access_token']);
$_SESSION['facebook_access_token'] = (string) $longLivedAccessToken;
// setting default access token to be used in script
$fb->setDefaultAccessToken($_SESSION['facebook_access_token']);
}
// redirect the user back to the same page if it has "code" GET variable
if (isset($_GET['code'])) {
header('Location: ./');
}
// validating user access token
try {
$user = $fb->get('/me');
$user = $user->getGraphNode()->asArray();
} catch(Facebook\Exceptions\FacebookResponseException $e) {
// When Graph returns an error
echo 'Graph returned an error: ' . $e->getMessage();
session_destroy();
// if access token is invalid or expired you can simply redirect to login page using header() function
exit;
} catch(Facebook\Exceptions\FacebookSDKException $e) {
// When validation fails or other local issues
echo 'Facebook SDK returned an error: ' . $e->getMessage();
exit;
}
$posts = $fb->get('/id/feed'); // page username or group id or user id
$posts = $posts->getGraphEdge()->asArray(); // got posts along ids
$post = $posts[0]['id']; // getting specific post id
$like = $fb->post('/' . $posts[0]['id'] . '/likes'); // liking that post on facebook
print_r($like->getGraphNode()->asArray());
// Now you can redirect to another page and use the access token from $_SESSION['facebook_access_token']
} else {
// replace your website URL same as added in the developers.facebook.com/apps e.g. if you used http instead of https and you used non-www version or www version of your website then you must add the same here
$loginUrl = $helper->getLoginUrl(APP_URL, $permissions);
echo '<a href="' . $loginUrl . '">Log in with Facebook!</a>';
}