Нет сеанса (Facebook SDK 4)

Question

Я создал веб-сайт, где я получаю и показываю информацию со страниц Facebook с помощью Facebook SDK 4. Сайт отлично работал на локальном хостинге с WampServer 2.5, но так как я загрузил его бесплатно хостинг сайта (он запускает PHP 5.4), URL-адреса Facebook не возвращают никакой информации, потому что сеанса нет.

Любые идеи?

<?php 
    session_start();// Starting Session 
    // storing session 
    $user_name = $_SESSION['admin_profile']['username']; 
    $user_pass = $_SESSION['admin_profile']['password']; 

    // Establishing connection with server by passing server_name, user_id and password as a parameter 
    $connection = mysqli_connect('xxx', 'xxx', 'xxx', 'xxx'); 

    // SQL query to fetch complete information of user 
    $ses_sql = mysqli_query($connection, "SELECT * FROM admin WHERE username='$user_name' AND password='$user_pass' "); 
    $rows = mysqli_fetch_assoc($ses_sql); 

    $login_session = $rows['username']; 

    // mysqli_close($connection); // Closing connection 
    if(!isset($_SESSION['login_user'])) 
    { 
     mysqli_close($connection); // Closing connection 
     header('Location: ../control_panel.php'); // Redirecting to home page 
    } 

    // Include required files form Facebook SDK 
    require_once('../facebook-php-sdk-v4-4.0-dev/autoload.php'); 
    require_once('../facebook-php-sdk-v4-4.0-dev/src/facebook/HttpClients/FacebookHttpable.php'); 
    require_once('../facebook-php-sdk-v4-4.0-dev/src/facebook/HttpClients/FacebookCurl.php'); 
    require_once('../facebook-php-sdk-v4-4.0-dev/src/facebook/HttpClients/FacebookCurlHttpClient.php'); 
    require_once('../facebook-php-sdk-v4-4.0-dev/src/facebook/Entities/AccessToken.php'); 
    require_once('../facebook-php-sdk-v4-4.0-dev/src/facebook/Entities/SignedRequest.php'); 
    require_once('../facebook-php-sdk-v4-4.0-dev/src/facebook/FacebookSession.php'); 
    require_once('../facebook-php-sdk-v4-4.0-dev/src/facebook/FacebookRedirectLoginHelper.php'); 
    require_once('../facebook-php-sdk-v4-4.0-dev/src/facebook/FacebookRequest.php'); 
    require_once('../facebook-php-sdk-v4-4.0-dev/src/facebook/FacebookResponse.php'); 
    require_once('../facebook-php-sdk-v4-4.0-dev/src/facebook/FacebookSDKException.php'); 
    require_once('../facebook-php-sdk-v4-4.0-dev/src/facebook/FacebookRequestException.php'); 
    require_once('../facebook-php-sdk-v4-4.0-dev/src/facebook/FacebookOtherException.php'); 
    require_once('../facebook-php-sdk-v4-4.0-dev/src/facebook/FacebookAuthorizationException.php'); 
    require_once('../facebook-php-sdk-v4-4.0-dev/src/facebook/GraphObject.php'); 
    require_once('../facebook-php-sdk-v4-4.0-dev/src/facebook/GraphSessionInfo.php'); 

    use Facebook\HttpClients\FacebookHttpable; 
    use Facebook\HttpClients\FacebookCurl; 
    use Facebook\HttpClients\FacebookCurlHttpClient; 
    use Facebook\Entities\AccessToken; 
    use Facebook\Entities\SignedRequest; 
    use Facebook\FacebookSession; 
    use Facebook\FacebookRedirectLoginHelper; 
    use Facebook\FacebookRequest; 
    use Facebook\FacebookResponse; 
    use Facebook\FacebookSDKException; 
    use Facebook\FacebookRequestException; 
    use Facebook\FacebookOtherException; 
    use Facebook\FacebookAuthorizationException; 
    use Facebook\GraphObject; 
    use Facebook\GraphSessionInfo; 

    $db = new mysqli('xxx', 'xxx', 'xxx', 'xxx'); 
    if (mysqli_connect_errno()) { 
     echo "Error: Could not connect to database. Please try again later."; 
     exit; 
    } 

    $print_result = ""; 
    $urlErr = ""; 
    $fb_url = ""; 

    $url_name = ""; 
    $url_picture = ""; 
    $url_link = ""; 



    /*---------------------Handle submit button----------------------*/ 
    if ($_SERVER["REQUEST_METHOD"] == "POST") { 
     if (empty($_POST["fb_url"])) { 
      $urlErr = "S?µp????ste Url"; 
     } 
     else { 
      $fb_url = test_input($_POST["fb_url"]); 
      $urlErr = ""; 
     } 
    } 

    if ($fb_url != ""){ 
     //INSERT Facebook link into database (Table: facebook_url) 

     // Init app with app id and secret 
     FacebookSession::setDefaultApplication('xxxxx','xxxxx'); 


     $session = FacebookSession::newAppSession(); 
     $accessToken = $session->getAccessToken(); 
     $session = new FacebookSession($accessToken); 

     if (isset($_SESSION) && isset($_SESSION['$accessToken'])) { 

      // Create new session from saved access_token 
      $session = new FacebookSession($_SESSION['$accessToken']); 

      // Validate the access_token to make sure it's still valid 
      try { 
       if (!$session->validate()) { 
        $session = null; 
       } 
      } 
      catch (Exception $e) { 

       // Catch any exceptions 
       $session = null; 
      } 
     } 
     $helper = new FacebookRedirectLoginHelper('http://mevent.gr/control_panel.php'); 



     if (!isset($session) || $session === null) { 
      // No session exists 
      try { 
       $session = $helper->getSessionFromRedirect(); 
      } 
      catch(FacebookRequestException $ex) { 
       // When Facebook returns an error 
       // handle this better in production code 
       print_r($ex); 
      } 
      catch(Exception $ex) { 
       // When validation fails or other local issues 
       // handle this better in production code 
       print_r($ex); 
      } 
     } 


     if (isset($session)) { 

      // Save the session 
      $_SESSION['$accessToken'] = $session->getToken(); 

      // Create a session using saved token or the new one we generated at login 
      $session = new FacebookSession($session->getToken()); 

      try { 
       $response = (new FacebookRequest($session, 'GET', "/$fb_url"))->execute(); 
       $object = $response->getGraphObject(); 
       $url_id = $object->getProperty('id'); 

       //Retrieve id of URL 
       $request = new FacebookRequest($session, 'GET', "/$url_id/?fields=name,picture,link"); 
       $response = $request->execute(); 
       $graphObject = $response->getGraphObject()->asArray(); 

       //Retrieve name, picture, link 
       $url_name = $graphObject['name']; 
       $url_picture = $graphObject['picture']->data->url; 
       $url_link = $graphObject['link']; 


       //INSERT 'url_id', 'fb_url' into table 'facebook_url' 
       $url_id = mysqli_real_escape_string($db, $url_id); 
       $fb_url = mysqli_real_escape_string($db, $fb_url); 

       $query = "INSERT INTO facebook_url (url, id_url) VALUES 
       ('$fb_url', '$url_id')"; 
       $result = $db->query($query); 
       if ($result){ 
        $print_result = "The facebook url inserted into database"; 
       } 
       else{ 
        $print_result = "The facebook url have already inserted into database."; 
       } 
      } 
      catch (FacebookRequestException $ex) { 
       //echo $ex->getMessage(); 
       //echo "Yes_1"; 
       $urlErr = "Invalid URL"; 
      } 
      catch (\Exception $ex) { 
       //echo $ex->getMessage(); 
       //echo "Yes_2"; 
       $urlErr = "Invalid URL"; 
      } 
     } 

    } 

?> 

Я отредактировал файл.

Answer 1

Проблема решена, так как я загрузил код на несвободного хостинг сайта. Вероятно, это был вопрос хозяина, позволяющий подключаться к Facebook SDK 4, например, «FacebookSession» и «FacebookRequest».

Answer 2

Изменить код:

<?php   
define('FACEBOOK_SDK_V4_SRC_DIR', '../facebook-php-sdk-v4-4.0-dev/'); 
require_once(FACEBOOK_SDK_V4_SRC_DIR."autoload.php"); 
session_start(); 
// all use statements afterwards