Facebook sdk v5 integration to codeigniter

I will suggest You to integrate using as a model . Unzip you facebook sdk . Put the unzipped folder in application/models . Rename the sdk folder to facebook .Now you can use the following code to instantiate FB and get a kick-start . You can use this model for querying facebook .

define('FACEBOOK_SDK_V4_SRC_DIR',APPPATH.'/models/facebook/');require_once("facebook/autoload.php");        use Facebook\FacebookSession;        use Facebook\FacebookRequest;        use Facebook\GraphUser;        use Facebook\FacebookRequestException;        use Facebook\FacebookRedirectLoginHelper;class facebook_model extends CI_Model {public $fb ;public $access_token ;public function __construct(){    parent::__construct();}public function facebookInit(){      $this->fb = new Facebook\Facebook([                                     'app_id'                => 'APP_ID',                                     'app_secret'            => 'APP_SECRET',                                     'default_graph_version' => 'v2.5',                                    ]);       return $this->fb ;                        } //function to get login url for your app . Just create a controller which     handles redirects after facebook login public function loginUrl(){    $helper = $this->facebookInit()->getRedirectLoginHelper();    $permissions = ['email','user_friends']; // Optional permissions    $loginUrl = $helper->getLoginUrl(site_url()."/FBController/", $permissions);    return $loginUrl ;  }}

Install php sdk v5 in codeigniter with composer https://www.sammyk.me/upgrading-the-facebook-php-sdk-from-v3-x-to-v5#installation-with-composer

create a controller and paste this code

$fb = new Facebook\Facebook([    'app_id'     => 'app_id',    'app_secret' => 'app_secret',    'default_graph_version' => 'v2.4',    'default_access_token' => 'access_token'    ]);    $response = $fb->get('/page_id');    $body = $response->getBody();

$body is an array, send it to your views for show your data.